How to restore my iphone 4 from ios 7 to ios 6.1.3?

I want to restore my iphone please help. I have the ios 6 file what are the steps.

Connect to itunes and i think click restore but click shift or ctrl or alt ( which ever 1 works) and look for the file

You could also just click restore and it would automatically downgrade it to ios 6

but if you are not a developer and you can't use your iphone, put it in dfu mode, (search on google).

Hope it works!

You don't need to do anything special, just plug your phone in and click restore.

Make sure your device's UDID is registered first. Go to http://www.instantudid.com/ and register your UDID for $5. They did mine instantly.