You can't change your iCloud email address without creating a new iCloud account. You can, however, create an @icloud.com alias address to use that will receive email in your current iCloud inbox. (@me.com addresses are no longer available.) This explains how: http://help.apple.com/icloud/#/mm6b1a490a.
Just be aware that an alias address cannot later be used to create a new iCloud account, be moved to a different account or be reactivated should you ever delete it.
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