Owing to confusion when setting up my iPad accounts, my iCloud user ID is different from my regular Apple ID, and I don't know how to correct this. Of course my iCloud isn't working while this disagreement exists. When I sign in to appleid.apple.com it simply tells me that 'this ID is already in use'. Well, I know that, but just want to get all my ID names to agree. Can anyone advise me on how to do this please? Thanks in advance for your expertise.