On the Fire go to Home Page / Settings / Device / Deregister.
The Fire will the restart and ask you to
- log into your wifi agin (probably)
- connect to an existing Amazon account (select and use your CORRECT Amazon account. Go slow. 99% of problems happen now when someone types in an account just one letter different!)
You will need to work through the various account options to reset things like mail, layout, advertiing and stuff.
NOTE: you may want to look at the Amazon HELP pages and search for Family Library to investigate linking two adult Amazon accounts and shareing all, some or none of your account and shared account benefits. Totally up to you.
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