if you brought from the amazon website, you can contact with the customer service directly and they will send a email to you which you can send back to USA amazon. The company will repair it or replace it and they will pay back the postal fee.
You go to Amazon web site and search kindle. You can follow steps to register first and then buy it in Amazon website. Kindle will be sent to u by post. Or u can download the kindle software at the Amazon website. You can read book in your phone, tablet or Pc through the kindle software.