I haven't used window forms for a while, but I believe the code you were originally using would be what you need to do in the button click event, where Form2 is the actual name of the form you created
Dim frmForm2 As Form2 = New Form2()
As far as the dialog describing the...
You can get the username of the person by using the
Dim strUsername as string = User.Identity.Name
Once you have that, you have a few options such as creating a table or two to set up the permissions and check with a simple query which is probaly your best bet if you'll have mutliple pages...