Since the IOS7 update I cannot use iCloud as the account has gone back to my old email address. Can anyone tell me how I can change the account details; I don't want to change my Apple ID - I know how to do that and also change the password - I want to know how to change the iCloud account from my old email address to my present one. I don't know how to do it and I can't seem to find any details of how to do it. Any suggestions please? Thanks.