Class Form1
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        WebBrowser1.Navigate("https://accounts.google.com/ServiceLogin?uilel=3&service=youtube&passive=true&continue=http%3A%2F%2Fwww.youtube.com%2Fsignin%3Faction_handle_signin%3Dtrue%26feature%3Dsign_in_button%26nomobiletemp%3D1%26hl%3Dcs_CZ%26next%3D%252F&hl=cs_CZ&ltmpl=sso")
    End Sub
    Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
        Dim theElementCollection As HtmlElementCollection
        theElementCollection = WebBrowser1.Document.GetElementsByTagName("input")
        For Each curElement As HtmlElement In theElementCollection
            Dim controlName As String = curElement.GetAttribute("name").ToString
            If controlName = "Email" Then
                curElement.SetAttribute("Value", "Your Email")
            ElseIf controlName = "Passwd" Then
                curElement.SetAttribute("Value", "Your Password")
            End If
        Next
        theElementCollection = WebBrowser1.Document.GetElementsByTagName("input")
        For Each curElement As HtmlElement In theElementCollection
            If curElement.GetAttribute("name").Equals("signIn") Then
                curElement.InvokeMember("click")
            End If
        Next
    End Sub
End Class