Yes, you can password protect your Kindle if you have the latest update. Here's how you can tell if you have the capability:
- With the Kindle on the Home screen, press the Menu button
- Scroll down (with the 5-way switch) to Settings and press in to select
- In the Settings screen, you should see Device Password at the bottom of the list. Scroll down until the words turn on is underlined (selected) and press in on the 5-way switch to select
- A Set Password dialog will appear. Enter the password you want to use, Type it again to confirm it.
- Enter a password hint to help you remember it
- Select Submit when finished
If you forget your password, move the 5-way controller down to view your password hint. Your Kindle will also give you the Kindle Support phone number so we can help reset your Kindle password.
If you lose your Kindle and you don't have it password protected, you can always go to your Amazon account on the web and Deregister your Kindle. This will divorce it from your account so whoever has it won't be able to purchase any new books. Unfortunately, they would have access to any books you already have on your Kindle. Then you can contact Amazon Customer Support and (I think) they can really render it useless. Click the word Help at the top right of the account area on Amazon. Navigate to the Kindle help area and look for a Contact Us button. It should be in the Self Service area on the right side of the web page. Amazon will phone you immediately. They are an amazing help resource.