Go to your All Classes page.
1) Click on your account drop-down
2) Click on Account Settings
This would lead you to the Account Settings page.
3) Click over the Payment Settings tab
You should see a screen as shown below:
4) Click on ADD NEW CARD to add a new card
Enter the card information. The boxes prompt you to type in the card number, expiration date, card security code (CSC) number, and billing address. Save the changes.
You have successfully added a new card.