diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index fff3889..2f3d310 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Set up Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: '1.23'
 
diff --git a/api/logic.go b/api/logic.go
index 1ff8722..5803598 100644
--- a/api/logic.go
+++ b/api/logic.go
@@ -42,7 +42,7 @@ var (
 func (p Props) Expired() bool {
 	const lag = 20 * time.Millisecond // for refresh synchronization
 	var d = time.Since(p.last)
-	return d < Cfg.PropUpdateTick-lag
+	return d > Cfg.PropUpdateTick-lag
 }
 
 func (u *User) GetProps(cid uint64) (p Props, ok bool) {
diff --git a/ui/frame.go b/ui/frame.go
index 7c1af7e..222f4f2 100644
--- a/ui/frame.go
+++ b/ui/frame.go
@@ -9,6 +9,8 @@ import (
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/data/validation"
+	"fyne.io/fyne/v2/layout"
 	"fyne.io/fyne/v2/widget"
 	"github.com/slotopol/balance/api"
 	cfg "github.com/slotopol/balance/config"
@@ -27,63 +29,6 @@ var (
 	Cfg = cfg.Cfg // shortcut
 )
 
-// Label compatible with ToolbarItem interface to insert into Toolbar.
-type ToolbarLabel struct {
-	widget.Label
-}
-
-func NewToolbarLabel(text string) *ToolbarLabel {
-	var l = &ToolbarLabel{
-		Label: widget.Label{
-			Text:      text,
-			Alignment: fyne.TextAlignLeading,
-			TextStyle: fyne.TextStyle{},
-		},
-	}
-	l.ExtendBaseWidget(l)
-	return l
-}
-
-func (tl *ToolbarLabel) ToolbarObject() fyne.CanvasObject {
-	tl.Label.Importance = widget.LowImportance
-	return tl
-}
-
-// Layout that fits the images to whole space and cuts edges if it needs.
-type FitLayout struct {
-}
-
-func (l FitLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) {
-	var ratiofit = size.Width / size.Height
-	for _, child := range objects {
-		var newsize = size
-		var pos = fyne.NewPos(0, 0)
-		if img, ok := child.(*canvas.Image); ok {
-			var ratioimg = img.Aspect()
-			if ratiofit > ratioimg {
-				newsize.Height = size.Width / ratioimg
-				pos.Y = (size.Height - newsize.Height) / 2
-			} else {
-				newsize.Width = size.Height * ratioimg
-				pos.Y = (size.Width - newsize.Width) / 2
-			}
-		}
-		child.Resize(newsize)
-		child.Move(pos)
-	}
-}
-
-func (l FitLayout) MinSize(objects []fyne.CanvasObject) fyne.Size {
-	var minSize = fyne.NewSize(0, 0)
-	for _, child := range objects {
-		if !child.Visible() {
-			continue
-		}
-		minSize = minSize.Max(child.MinSize())
-	}
-	return minSize
-}
-
 func GetProp(cid uint64, user *api.User) (p api.Props, err error) {
 	if p, _ = user.GetProps(curcid); !p.Expired() {
 		return // return cached
@@ -117,9 +62,81 @@ func FormatAL(al api.AL) string {
 
 type Frame struct {
 	fyne.Window
+	SigninPage
 	MainPage
 }
 
+type SigninPage struct {
+	// Backgroud image
+	underlay *canvas.Image
+
+	// Form widgets
+	host   *widget.Entry
+	email  *widget.Entry
+	secret *widget.Entry
+	form   *widget.Form
+	errmsg *widget.Label
+
+	// Page frame
+	signinPage *fyne.Container
+}
+
+const descrmd = `# SLOTOPOL credentials
+
+To be able to view and change balance of users, the account must have the administrator access permission for working with *users*. To be able to view and change contents of the club bank, deposit and jackpot fund, the access permission for working with the *club* is required.
+`
+
+const (
+	hostRx  = `^((http|https|ftp):\/\/)?(\w[\w_\-]*(\.\w[\w_\-]*)*)(:\d+)?$`
+	emailRx = `^\w[\w_\-\.]*@\w+\.\w{1,4}$`
+)
+
+func (p *SigninPage) Create() {
+	// Backgroud image
+	p.underlay = &canvas.Image{
+		Resource:     AnyUnderlay(),
+		FillMode:     canvas.ImageFillContain,
+		Translucency: 0.85,
+	}
+
+	// Description
+	var descr = widget.NewRichTextFromMarkdown(descrmd)
+	descr.Wrapping = fyne.TextWrapWord
+
+	// Form widgets
+	p.host = widget.NewEntry()
+	p.host.SetPlaceHolder("http://example.com:8080")
+	p.host.Validator = validation.NewRegexp(hostRx, "not a valid host")
+	p.host.Text = cfg.Credentials.Addr
+	p.email = widget.NewEntry()
+	p.email.SetPlaceHolder("test@example.com")
+	p.email.Validator = validation.NewRegexp(emailRx, "not a valid email")
+	p.email.Text = cfg.Credentials.Email
+	p.secret = widget.NewPasswordEntry()
+	p.secret.SetPlaceHolder("password")
+	p.secret.Text = cfg.Credentials.Secret
+	p.errmsg = widget.NewLabel("")
+	p.errmsg.Wrapping = fyne.TextWrapWord
+	p.form = &widget.Form{
+		Items: []*widget.FormItem{
+			{Text: "Host", Widget: p.host, HintText: "Host address of server"},
+			{Text: "Email", Widget: p.email, HintText: "A valid registered email address"},
+			{Text: "Secret", Widget: p.secret, HintText: "Password for authorization"},
+		},
+	}
+
+	p.signinPage = container.NewStack(
+		NewImageFit(p.underlay),
+		container.NewVBox(
+			layout.NewSpacer(),
+			descr,
+			p.form,
+			layout.NewSpacer(),
+			p.errmsg,
+		),
+	)
+}
+
 type MainPage struct {
 	// Backgroud image
 	underlay *canvas.Image
@@ -244,7 +261,7 @@ func (p *MainPage) Create() {
 
 	// Main page
 	p.mainPage = container.NewStack(
-		container.New(FitLayout{}, p.underlay),
+		NewImageFit(p.underlay),
 		container.NewBorder(
 			container.NewVBox(p.toolbar, p.clubTabs),
 			nil, nil, nil,
diff --git a/ui/startup.go b/ui/startup.go
index 29e6f98..fa98dbe 100644
--- a/ui/startup.go
+++ b/ui/startup.go
@@ -13,20 +13,6 @@ import (
 	cfg "github.com/slotopol/balance/config"
 )
 
-func (f *Frame) MakeSignIn() (err error) {
-	if err = cfg.ReadCredentials(); err != nil {
-		log.Printf("failure on reading credentials, using default: %s\n", err.Error())
-		err = nil // skip this error
-		return
-	}
-	if api.Admin, err = api.ReqSignIn(cfg.Credentials.Email, cfg.Credentials.Secret); err != nil {
-		return
-	}
-	f.loginTxt.SetText(fmt.Sprintf(cfg.Credentials.Email))
-	log.Printf("signed as '%s'", cfg.Credentials.Email)
-	return
-}
-
 func (f *Frame) MakeClubList() (err error) {
 	var cl api.RetClubList
 	if cl, err = api.ReqClubList(); err != nil {
@@ -113,7 +99,6 @@ func WaitToken() (err error) {
 
 func (f *Frame) StartupChain() {
 	var chain = [](func() error){
-		f.MakeSignIn,
 		f.MakeClubList,
 		f.MakeUserList,
 	}
@@ -126,19 +111,51 @@ func (f *Frame) StartupChain() {
 }
 
 func (f *Frame) CreateWindow(a fyne.App) {
+	var errCred error
+	if errCred = cfg.ReadCredentials(); errCred != nil {
+		log.Printf("failure on reading credentials, using default: %s\n", errCred.Error())
+		return
+	}
+
 	f.MainPage.Create()
+	f.SigninPage.Create()
 
-	go f.StartupChain()
 	go WaitToken()
 
 	var w = a.NewWindow("Balance")
 	w.Resize(fyne.NewSize(540, 640))
-	w.SetContent(f.mainPage)
+	w.SetContent(f.signinPage)
 	f.Window = w
 
+	var submit = func() {
+		f.loginTxt.SetText(cfg.Credentials.Email)
+		w.SetContent(f.mainPage)
+		go f.StartupChain()
+		f.SigninPage.form.OnCancel = func() {
+			w.SetContent(f.mainPage)
+		}
+		f.SigninPage.form.Refresh()
+	}
+	f.SigninPage.form.OnSubmit = func() {
+		var err error
+		if api.Admin, err = api.ReqSignIn(f.email.Text, f.secret.Text); err != nil {
+			f.errmsg.SetText(fmt.Sprintf("can not sign in with given credentials, %s", err.Error()))
+			return
+		}
+		cfg.Credentials.Addr = f.host.Text
+		cfg.Credentials.Email = f.email.Text
+		cfg.Credentials.Secret = f.secret.Text
+		log.Printf("signed as '%s'", cfg.Credentials.Email)
+		submit()
+	}
+	f.SigninPage.form.Refresh()
 	f.userTable.SetColumnWidth(0, 180) // email
 	f.userTable.SetColumnWidth(1, 100) // wallet
 	f.userTable.SetColumnWidth(2, 50)  // mtrp
 	f.userTable.SetColumnWidth(3, 150) // access
 	f.userTable.ExtendBaseWidget(f.userTable)
+
+	if cfg.Credentials.Addr != "" && cfg.Credentials.Email != "" {
+		//submit()
+	}
 }
diff --git a/ui/widgets.go b/ui/widgets.go
new file mode 100644
index 0000000..68b9132
--- /dev/null
+++ b/ui/widgets.go
@@ -0,0 +1,72 @@
+package ui
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+)
+
+// Label compatible with ToolbarItem interface to insert into Toolbar.
+type ToolbarLabel struct {
+	widget.Label
+}
+
+func NewToolbarLabel(text string) *ToolbarLabel {
+	var l = &ToolbarLabel{
+		Label: widget.Label{
+			Text:      text,
+			Alignment: fyne.TextAlignLeading,
+			TextStyle: fyne.TextStyle{},
+		},
+	}
+	l.ExtendBaseWidget(l)
+	return l
+}
+
+func (tl *ToolbarLabel) ToolbarObject() fyne.CanvasObject {
+	tl.Label.Importance = widget.LowImportance
+	return tl
+}
+
+type CenterVBoxLayout struct {
+}
+
+// Layout that fits the images to whole space and cuts edges if it needs.
+type ImageFitLayout struct {
+}
+
+func NewImageFit(objects ...fyne.CanvasObject) *fyne.Container {
+	return container.New(ImageFitLayout{}, objects...)
+}
+
+func (l ImageFitLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) {
+	var ratiofit = size.Width / size.Height
+	for _, child := range objects {
+		var newsize = size
+		var pos = fyne.NewPos(0, 0)
+		if img, ok := child.(*canvas.Image); ok {
+			var ratioimg = img.Aspect()
+			if ratiofit > ratioimg {
+				newsize.Height = size.Width / ratioimg
+				pos.Y = (size.Height - newsize.Height) / 2
+			} else {
+				newsize.Width = size.Height * ratioimg
+				pos.Y = (size.Width - newsize.Width) / 2
+			}
+		}
+		child.Resize(newsize)
+		child.Move(pos)
+	}
+}
+
+func (l ImageFitLayout) MinSize(objects []fyne.CanvasObject) fyne.Size {
+	var minSize = fyne.NewSize(0, 0)
+	for _, child := range objects {
+		if !child.Visible() {
+			continue
+		}
+		minSize = minSize.Max(child.MinSize())
+	}
+	return minSize
+}