I have multiple devices registered at Amazon, and I entered the wrong email address for the device I wanted to send my ebook to.
How do I change my account and resend the ebook to the correct device?
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I think that these instructions should help you:
It appears as if you can go to Amazons "Manage Your Devices" page to update/change information. If you need further assistance please let me know, and I'd be happy to look into it.
Customer Service Representative