How to restore my Verizon iPhone 4 from iOS 7 to iOS 6.1.3?

I downloaded iOS 7 beta thinking it would be good but I was sadly mistaken. This beta version has so many bugs that it's pretty much turned me off from iOS 7. I currently have iOS 7 beta version 2 and I downloaded iOS 6.1.3 iPhone 4 CDMA. After I control-clicked. A message popped up saying that the firmware was not compatible. I've double checked all the data in my iPhone and I'm pretty sure that I'm using the right software to download it. Can I have some help?

Where did you download the ios7 beta

Looks like 7 Didn't suit you up.k so first go this site
http://www.jailbreaknation.com/downgrade-ios-7-7.0-to-ios-6-6.1.46.1.3-iphone-and-ipod-touch

and download the ios 6.1.3 software there and just the way you did to update ios 7 do it the same way, you have to hold alt if mac or shift if windows and then select the firmware and the update is done! And then go to general > software update on your iphone and check if there's any other update and update it. (very important)

See this for easy explanation:

and please tell where you downloaded the ios 7 beta version for free. Please it would be very nice for me.