I use this to load and login to a site from a made form but should work or give you an idea.
Private Sub LogInSub()
On Error GoTo err1
WebBrowser1.Navigate(" webaddress")
While WebBrowser1.ReadyState <> WebBrowserReadyState.Complete
Application.DoEvents()
End While
Dim theElementCollection As HtmlElementCollection
theElementCollection = WebBrowser1.Document.GetElementsByTagName("Input")
For Each curElement As HtmlElement In theElementCollection
Dim controlName As String = curElement.GetAttribute("id").ToString
If controlName = "email" Then
curElement.SetAttribute("Value", "username for site")
End If
Next
theElementCollection = WebBrowser1.Document.GetElementsByTagName("Input")
For Each curElement As HtmlElement In theElementCollection
Dim controlName As String = curElement.GetAttribute("id").ToString
If controlName = "password" Then
curElement.SetAttribute("Value", "password for site")
End If
Next
WebBrowser1.Document.Forms("login_pw").InvokeMember("submit")
err1:
Exit Sub
End Sub