Hi there and welcome
Can you tell me please, what exactly happens when you try to register the Kindle?
Can you please click on my link below
And follow the steps to reset your password. You do this via your computer
Once done, then use the new password ***** the Kindle
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.