noob help: unlocked tmobile phone; no data on ATT

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http://forum.xda-developers.com – hi - i have an unlocked galaxy s2 (tmobile branded) that i'm trying to make work on att. the phone works to receive and make calls/texts, but doesn't do anything data related unless i'm on a wifi signal (apps, mms, internet, etc). my questions are: 1. someone told me this can be resolved by updating the APN settings, but I cant figure out how to do that. Is that something ATT will help me with? Or is there a simple way for a novice user to do it? 2. is my data going to completely stink? I read on another thread that this might only give me access to EDGE/2G (though I'm not sure why). Is (HowTos)