Flash 8 and pop-ups

Please be gentle as I am much less than a novice when it comes to Flash. I read the tutorial about [SIZE=4][COLOR=#003366]Launching[/COLOR][/SIZE][FONT=Verdana][SIZE=4][COLOR=#003366] a Centered Pop-Up Window. [SIZE=2][COLOR=black]That was quite helpful, actually, you gave me the complete answer. Here’s my delima; I’m not too sure where it needs to go on the time line since i’m addin the popup to an existing project. [/COLOR][/SIZE][/COLOR][/SIZE][/FONT]