Hello! Thank you for contacting JustAnswer.com; I am Russell H., an Expert here at JustAnswer.com, and I will do what I can to answer your question as well as it can be answered.
Purchasing a Kindle online does not register it to your Amazon.com account - and that, registering it to your Amazon.com account, is necessary on receiving it and setting it up for the first time.
Entering a new password *****'t work - except if you are assigning a new password ***** the new device, as opposed to registering it to Amazon. Password ***** have to be done, for online accounts like an Amazon.com account, by entering the old password ***** or logging in with the old password *****
Then after registering the new device with the old Amazon.com password, you can change your Amazon.com password ***** I think.
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