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Amazon adds devices to your account in the order in which you add them or register them. That means that unless you changed it, your kindle fire will be default.
To do that, go to your Amazon.com and login if needed. Once signed in, mouse over the Your Accountdropdown button near the top right corner of the page, and click on the "Manage your content and devices" link in the menu.
On the next screen, click on the Your Devices tab in the middle. This will load the list of all devices and Kindle apps currently associated with your account. Click on the one you want to set as the default for delivery and purchases.
Please let me know if this does not work or if you need any other assistance.
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okay, try this next please>
on your Kindle> press and hold the power button for 20 seconds and then release. Then when the kindle powers back on>