You get an email when you buy a kindle that says welcome to kindle, if this was a gift click this link and go to "deregister this kindle"
Did you not receive this email?
You may however, want to associate all of your kindles to one account, so that you can share books that you purchase at the amazon bookstore. I do not think you can do that if you have 2 separate amazon accounts.
Keep this in mind.
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