Hi Buck

All I want is a message pop-up box saying "Blah Blah
Blah" first thing,
when I open an excel file?

I'm sure this would have come back to you in a few
minutes, anyway ... ;-)

Start VBA
In the ThisWorkBook module, enter:
Private Sub Workbook_Open()
MsgBox ("Blah Blah Blah")
End Sub

Of course you also could have created the sub in various
other ways.

Jeremy