When you purchase web services or an ad from IndieMe you have the option of entering a credit card for payment purposes. To change a credit card previously entered on an existing order with IndieMe navigate to Artist>My Statements. Select an open invoice that is set for Auto Draft. Scroll down to Update Payment Information, enter your new card number and select the Update Button.
Please note that changes to credit cards can be made up to the day prior to the card being charged.