There is a complication with modules of that nature in that email is not unique by default (you can make it so by setting RequiresUniqueEmail in the web.config but this must be done at install time -if it's changed after install and 2 users have the same email neither can log in)

That said, if it is unique, then to retrieve the relevant user then code such as this will retrieve the user object by email after which you can retrieve any of the users details.

If MembershipProviderConfig.RequiresUniqueEmail AndAlso _
      Trim(txtEmail.Text) <> "" Then
    arrUsers = UserController.GetUsersByEmail(PortalSettings.PortalId, txtEmail.Text, 0, Int32.MaxValue, 1)
    If Not arrUsers Is Nothing AndAlso arrUsers.Count = 1 Then
     objUser = DirectCast(arrUsers(0), UserInfo)
    End If
 End If

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