My name is***** am sorry to hear that you are having this issue.
I will be glad to assist you with this.
You can reply to me here by typing in the box below please.
Try these steps please.
Register your Kindle to your Amazon account to buy and download content to your device. Help for Kindle Paperwhite (5th Generation).
To buy and download content, you'll need to connect wirelessly and register your Kindle to an Amazon account. Registering also allows you to download your purchases from other Kindle devices and Kindle reading apps.