Barbara. Depending on your kindle model it should be under settings registration. If you dont find it just go to "My content and devices" ( on the Amazon website My account) the device tab, deregister it from there and simply log back on the device. It should do the trick.
Jul 05, 2018 Cracking Open the Amazon Kindle Fire - Page 14 - TechRepublic Nov 16, 2011 Amazon Kindle review | TechRadar Nov 14, 2019 Cracking Open: Amazon Kindle Touch (2011) - TechRepublic
Amazon's Kindle Fire, like most of today's e-reader tablets, is no longer just for reading books. The Fire allows access to multiple file types, including PDFs in both the native and Kindle formats, and offers the flexibility to view files on the device's screen or connect it to a projector or external monitor.
Already have an Amazon account? Sign in to Kindle Direct Publishing (KDP) with your existing Amazon username and password. Don't have an Amazon account? Go to KDP and click Sign up. Then click Create your KDP account and enter your name, email address, and a secure password. A guide to publishing on Amazon Can the Kindle Fire Open PDF Files? | Your Business Amazon's Kindle Fire, like most of today's e-reader tablets, is no longer just for reading books. The Fire allows access to multiple file types, including PDFs in both the native and Kindle formats, and offers the flexibility to view files on the device's screen or connect it to a projector or external monitor.
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Fix for Book That Won't Open on Kindle App - YouTube Oct 22, 2014