What to install for my udid to work?

I used this webiste 'http://www.udid.in'' to get ios 7 on my iphone 4s but i don't know what to install for it to work i've updated my itunes as it said, anyone know?

Youll need to go to iMZDL.com and go to ios 7 beta 5 or whatever the most recent one is, find your model, download the TORRENT, and port it to your phone.hold option and press restore then select the ipsw and hit restore. Hope this helps!

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