How to go back to 6.1.3 from 7 because not a developer.lock button broken?

I tried to put ios 7 to my iphone through itunes and it installed successfully installed in my iphone. But i'm not a developer.itunes saying device not registered as developer. I can't restore my iphone because my lock button is broken. And itunes not recognizing iphone could any one help please!

You can't.
you will need to wait a month or so til ios 7 is offically released.

You absolutely need to register your device's UDID with a site like http://www.instantudid.com/.It's only $5 and they do instantly.