If you have multiple payment methods saved, you can select which is your default or delete cards that you no longer wish to use.
Set Default Payment Method
Go to the Billing page, and you will see a list of saved Payment Methods.
Select the card that you want to be used as the default payment method by clicking the Set as Default link, or delete a card from your account by clicking the Delete link. See the “Add New Payment Method” support post to see how to add a different card to your account.