Motorola ROKR E1

Ok, so I bought this phone unlocked and have it hooked up with T-Mobile. I can't seem to figure out how to send a MMS. Everytime I try it says unable to send. How do I get this feature to work? Also, when I try and connect to the web it gives me an error. I know I have to manually configure the settings, but dont know how. I got all the info I need from TMo's website I think, but dunno how to put it in. PLEASE PLEASE PLEASE HELP.