You can update your Credit Card information under the Credit Cards tab at the top of your member account.
Click the Credit Cards tab
Click Add Credit Card
Enter your updated information and click Add Credit Card at the bottom.
All new card numbers are verified with a $1 charge (and voided immediately)
Click the trashcan icon on the right next to the card with the old information to delete it from your account.
*Note: the button will only allow you to update your name and billing address. To update your CC numbers/exp date, you must click Add Credit Card and enter your card information there.