Q: I want to cancel email address, I messed up, and put the wrong email name. How do I cancel my email account?

You can't change your iCloud (@icloud, @me or @mac) email address once you create it without changing your iCloud account.  You can, however, create an alias address to use which will receive email in your current iCloud inbox.  See http://help.apple.com/icloud/#mm6b1a490a.