iPhone HELP - with ios 7 instalation

Hi guys,
I apologize if this is in an incorrect section of the forum, im very new to this and am unsure were to post.

Earlier today i installed ios7 - Beta 5 on my iphone 5, following instructions off a website.
Once completed i received a message,
" Activation Error - This Device is not registered as part of the iphone developer program ".

As i understood by downloading and installing how i did, i avoided this aspect. i am now unable to anything with phone or when it is plugged into iTunes.
I would appreciate a Solution to resolve this and have a functioning ios7
Thanks Alot