Changing Payment Methods
You can change the payment method for an order you've already placed, provided the order has not yet entered the shipping process. Just visit the relevant order summary in My Account and under Shipping Information click the Edit button next to Payment Method.
Adding a Credit Card
You can add a new card or account the next time you place an order through the Shopping Bag. Or, if you prefer to use Express Checkout, you can add a credit card through My Account using the option to "View or change your Express Checkout settings."
Deleting a Credit Card
If you don't have any open orders and simply want to delete a credit card or update information for an existing card, go to My Account and click the "Edit credit card" link.
Once you've signed in using the e-mail address and password linked with your account, you'll be able to edit or delete any credit card you have on file. Doing so will not, however, update payment information for orders you have already placed. To do that, visit the relevant order summary in My Account.