Unfortunately, you cannot directly use Bitcoin on Amazon yet. Although there have been rumors that Amazon may eventually accept Bitcoin as a payment method, no official announcements have been made to date and it is unclear whether this will ever happen. In the meantime, if you are really interested in using your Bitcoins for purchases from Amazon, there are a few alternative methods available. One such method is to exchange your Bitcoins for gift cards from a trusted vendor like eGifter or Gyft which can then be redeemed for goods on Amazon. Another option is to purchase items through services like Purse which enable customers to buy products with their cryptocurrency of choice at discounted prices even though they're not accepted directly by Amazon itself.