You can cancel items or orders that haven't shipped by visiting the Order section in Your Account.To cancel an item or an entire order:
After submitting the cancellation, we'll send you a confirmation message to the e-mail address on your account.
You can also confirm that the order was canceled in Your Account. If you don't see the order in Your Account, it was successfully canceled.
If your order shipped directly from Amazon.com and cannot be modified, you may refuse the package or return it using our Online Returns Center.
If your order shipped directly from a seller and cannot be modified, please contact the seller for instructions. For more information on how to contact the seller, go to Contact Third-Party Sellers.