Which site is this for? Pokerstars for example permits importing 30 observed hands which leads some to believe auto importing is working when in reality it is not.
Besides installing the poker site software in English about the only two things which would need to be done are 1) enable the "save my hands" option in the poker site cashier window and play a couple hands without PokerTracker3 then 2) tell PokerTracker3 where the site will be saving the new hands which you'd note in step #1.
This is our list of poker site guides which cover the steps to ensure things are properly configured (right-hand side):
http://www.pokertracker.com/products/PT3/docs/The one other thing which I suspect wouldn't apply to you is that there are so many old files for PokerTracker3 to sift through when starting it that the HUD is never able to start - that problem is addressed here:
http://www.pokertracker.com/forums/viewtopic.php?f=45&t=22715Mike