PokerTracker

How do you look at your stats(vpip-pfr) for each session?

You can't do that on the Sessions report at the moment - the way the report's stats are built means that it would be very processor intensive to show that information.
You can double click a session (or sessions) to select them and switch to the other tabs to see your stats, though.

I am using PT3, double clicking a session doesn't work,it did in PT2 but not in Pt3.

Upgrade to Beta 23 and double clicking the session will work in that version.