help in webbrowser website login

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VB

How can I open three emails that opens first and goes back to open the second and then the third and when done write msgbox done.

I use this code but when it opens the first email does not open the second email.

    For i As Integer = 0 To RichTextBox1.Lines.Length - 1
    Dim str As String = RichTextBox1.Lines(i).ToString
    Dim str1 = str.Split(":")(0).ToString
    Dim str2 = str.Split(":")(1).ToString
    WebBrowser1.Document.GetElementById("username").SetAttribute("value", str1)
    WebBrowser1.Document.GetElementById("passwd").SetAttribute("value", str2)
    WebBrowser1.Document.GetElementById(".save").InvokeMember("click")
    System.Diagnostics.Process.Start("rundll32.exe", "InetCpl.cpl,ClearMyTracksByProcess 2")
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