HELP!!!

Hello everyone,

I have recently changed my password by accident and now I cannot get into my iPhone 5s, but it gets bad. When I connect my iPhone to iTunes on my MacBook Pro, I can't back it up because it says: 'iTunes could not back up the iPhone “iPhone” because it is locked with a passcode. You must enter your passcode on the iPhone before it can be backed up.' So I cannot back it up and I also can't restore it because "Find my iPhone" has to be turned off. I've gone into iCloud, logged in and clicked into "Find my iPhone" but it says all devices are offline! I have tried figuring out the passcode and googled a number of things that might help, but nothing! HELP ME PLEASE!!!!! I'm on iOS 8.2