Won't connect to AT&T after custom ROM?

[T4yB4cK]

This is my first time putting a custom ROM on a phone and I followed this procedure exactly: (How to upgrade the Samsung Infuse 4G I997 to Android 4.1.1 Jelly Bean) and it did work... but now my Infuse won't connect to the AT&T network, therefore I cannot make phonecalls or send texts (wifi works fine). Also I noticed in an app I have (iMobsters) which uses some form of internal ID to load your profile, it had someone else's profile automatically signed in. I have no idea what is going on. I just want my phone to work again so even if you can give me instructions on how to restore my phone to the point it was at before I applied this ROM.

 

[T4yB4cK]

Nevermind, I fixed it

 

[gothchild]

how did u fix it?