Instance of an object

[Beengie]

I am getting an "Object reference not set to an instance of an object" error on this code. I have searched the forums, but I cannot seem to find an example that is helping me. I am used to VB6, and trying to understand the basics of .NET

This is in a module, and there is a label on the frmMain called lblTestOutput

Public Sub MakeChanges()
        Dim f As New frmMain
        If f.lblTestOutput.Text = "" Then
            f.lblTestOutput.Text = "Button Pushed!"
        Else
            f.lblTestOutput.Text = ""
        End If
 
    End Sub

Also, I am wondering...

what is the correct way to load up a form using "Sub Main?"