Amazon does not have a button that allows consumers to purchase items with a PayPal account. However, there is a way to use your PayPal account to purchase items from Amazon.
Log into your PayPal account and register for a PayPal debit card by clicking on the "debit card" tab from the main menu. A PayPal debit card works the same as a regular debit card and allows you to purchcase items off websites that do not have PayPal links.
Wait for the card to arrive in the mail, then activate it by calling the telephone number listed on the attached sticker. Your card will be immediately activated and ready for purchases.
Log into your Amazon account and add your desired items to your cart. Once you proceed to checkout, you will be asked to enter your credit card payment information. Use your debit card as you would use a traditional credit card. Press confirm and your payment will be processed.