HELP! Battlefront II and Leo.....

I need help.

We have Battlefront II for the guys' Playstation 3.  Leo wants to play it online with other players (not other players here but other players online).  I've been googling and wikipediaing my ass off and I have no idea how to make that happen.

I remember when my parents parted ways with technology and all of a sudden they couldn't make remotes or vcrs work any longer.....could that be happening to me already?

Anyway....the happiness of one sweet boy is in your hands..... (and don't forget I have mac if that has anything to do with this.....)