To change or update your credit card, please log into the My Account section and click on the "Account Settings" tab, and navigate to the Billing Information, and select edit. If you also update the Billing Address, this does not automatically update the Shipping Address as well. You will also need to update this information in the appropriate field.
Please note that an authorization hold of $1.00 USD may be placed on the card to verify the validity, and availability of funds when the card details are updated. This is not a charge, and the hold will drop off in a few days.