Trying to download books, says not registered. does not recognise my account details. Any ideas

How to Set Up Your Kindle Fire dummies

Above is detailed advice from the famous book series.

To register your Kindle:

1. From Home, tap the Menu icon, and then tap Settings.
2. Tap My account.
3. Choose the Amazon account you want to use on your Kindle: If you already have an Amazon account: Tap this option. Enter your Amazon account information. Tap Register.

Just create the Amazon account and register your device to the user. After this you can download the Kindle books on your device. Apart from this you can ask for the Support to amazon Kindle Technical Support Registration 877 690 9305

It should when first set it up but if u just gone home screen go to setting my device or account and go to register it

Register the new Kindle to the same account as the old one and tour old books should be available to be downloaded to the new one. Be sure to remove the old device from the account as well.

Yes, if you register the second computer to the same Amazon account that you set up on the first computer. (Note: Amazon limits to six the number of devices that you can download a given book to.)

To download books onto your second computer, first load the Kindle app to the computer and register it. Then run the app and access the Archive associated with your account. (The archive will be shown as an entry on the same screen that your books will be listed or displayed on.) Just click on the Archive and you will see a list of all books that you have purchased from Amazon (assuming that they have not already been downloaded to the maximum number of permitted devices, in which case you won't see them or if you do see them, you won't be able to download them until you erase them from another machine) . Click on a book and it will immediately be downloaded to your (second) computer.

very simply, you access the Kindle devices "Settings" page and in the section that says register/deregister, you would click on the deregister option, once the device is online with the built-in wireless network connection. After which, the device is ready to be registered to a new account.
Please be aware that just changing the devices account registration does NOT delete any content; also changing registration does not provide the new owner the legal access to the books already downloaded to your Kindle, the original account that purchased the books, will retain ownership.
There is no way to give your purchased book library to the new owner of your old Kindle. If the new owner likes the books, then they will have to buy them on their own, to retain future downloading rights.

just log into your account an check the settings for that device , i have several i manage but no errors yet.

To get your books you have to first register your Kindle to your Kindle account. You can do this using a laptop or desktop to log onto your account. Then you can register your device. Or, you can try registering your device in Settings on your device provided you are connected to WiFI or Whisperssynch aka 3G.

While connected to WiFI or Whispersynch then you have to touch *Cloud*, locate the books you want downloaded to your Kindle and touch them. They should start downloading to your device and be downloaded within minutes or less.

Hi
If you sign into your account and click on Help and then click "Go to Your Account", you get to a page with lots of links for various actions, then under Payment Methods, there is a link "Manage your Payment Methods". This will show you the cards that Amazon has registered to your account, and you can edit or delete the cards. On the previous page there is also a link to "Add a new card".This brings up a page where you can put in all the details for your new card. You can enter your details here, but they must exactly match the card details or it will be rejected when check with your card supplier.
Hope this is helpful, if so would you please register that with Fixya
Cheers

First, you need to deregister the Kindle from the old account.

Deregistering will retain the already downloaded books on the E-Ink devices but wipes all purchased content tied to the old account from e.g. Kindle Fire. You cannot restore books from the cloud anymore you purchased on the old account and access to the shop is blocked until the device is registered again. Other Kindle's on the same account and the account itself remain unaffected.

You can do the deregistration from the Kindle's settings menu --> Registration or alternatively from an Amazon web site:

Log in to http://kindle.amazon.com using the old credentials (email + password).

Next, select "Manage Your Kindle" from menu that opens when you hover the mouse over the "Hello, <Name>" link in the upper right corner of the page.

Click on the center tab "Your Devices" and review the list of Kindle devices and software readers tied to your account. Select the device to deregister and click on "deregister" below.

To register the Kindle to a new account, go online with the Kindle, and follow the registration procedure callable from the settings menu. Find a detailed description on
http://www.amazon.com/gp/help/customer/display.html?nodeId=201242220