How to change iCloud info on an iPhone 4?

I just updated to iOS7 and i need to put in my iCloud information. I recently changed the email I use for it but my phone didn't recognize the change and it won't let you edit it on the phone. I tried to delete the account to start over, but every time I try to delete it a pop up says I have to enter my password to turn off Find My Phone, but I can't get the password right because the email in there's wrong and you can't change it. So frustrating

Try changing your account in the iTunes store first

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