I need to configure my Miami Ink T-Mobile V3 Razr to send mms through AT&T

I just bought a Miami Ink V3 T-Mobile Razr on Ebay. I cannot figure out how to configure it to work with AT&T. There is info on the AT&T website but this is not the same as a V3 Razr. It doesn't have the same Icons as the regular V3 Razr. It doesn't have the web sessions or anything like that. I would also like to get rid of the TMoblie T Zones Crap that is on the phone too. I would have probably never had bout the pphone had I known. I have never bought an unlocked phone. Please can someone help me figure this out.