PokerTracker

I have recently started using my free trial of PT3 and when I opened it, it worked nice and all but when i went to put my Screen name for my real money account for pokerstars in, i saw that the program had already put in my play money account from FTP instead. how do i change it so i can have PT3 running for my Real money pokerstars account?

You don't need to change it, you just need to configure PT3 to import the PokerStars information - once that's done PT3 will get both sets of data. You can set your default screen name via the Settings button in the main PT3 View Stats tab.