How to uninstall ios7 from iphone 5?

I downloaded ios7 off of iphonefirmware.com, i like it however it's just making my phone slow. So i reset all settings from my phone and now it's saying that i'm not apart of the apple developer program and when i plug it into itunes it won't sync. Wondering if anyone has any tips for me, websites or anything that would help!

Yes you can. You will need to download the latest iphone 5 ipsw which is ios 6.1.4. Get it from a trusted place like iclarified.com. Then plug device to pc. Then in itunes click shift + restore or option + restore on mac. The select the ipsw you downloaded. And wait till it finishes. If it doesnt work then right after you plug in your device, enter it into dfu mode and then donthe rest. Good luck.

What is dfu mode?