It's very easy to set up, but tourneys can get a little tricky.
For ring games you just need to tell it the directory of your saved hands, that will be under the poker stars directory, under a sub directory with your handle name.

For tourneys you need in addition to that to import the tournament summaries. You have to go to the request menu in the main poker stars window, and ask for tournament summaries (second or third option).
It sends you an email with the buy ins, results, start and end times, and a few other details about the tournament, which PT requires in order to show you the tourney.
You can either set PT to read those directly from your mailbox, or easier, just save the email to a file, open PT, file menu, import tournament summaries (first option I think), click browse and point it to the file you saved.
That should get you going.