Unique code for analytics set up

Hi, probably a very basic question, but I’m a very basic user (but learning quickly)!

I’ve just installed the Xavisys Google Analytics plugin – it all seems to be showing in the page codes etc, but it’s showing the generic – var pageTracker = _gat._getTracker(“UA-xxxxxx-x”);

How dow I get the unique page reference to replace the XXXXX bit? Where will I find it and should the plugin do the replacement automaticaly – because at present it’s not! Don’t mind adding it manually just need to know where to get the reference.

Thanks for any help