Your Saved Card
Keep one card on file for faster checkout and automatic renewals.
You can keep one card on file with your club. It's used when you pick Saved Card at checkout and for plans with auto-pay. It's under My Profile → Payment Methods, which only appears if your club takes card payments online. The plans and payments pages show it at the top (Card on file: … ending in …), with Manage Card or Add Card taking you to My Profile.
Adding or changing your card
Open My Profile → Payment Methods
Card on File shows your card, or "No card saved".

Add Card or Update Card
Enter the card details in the secure card form and save. The card details go to the payment provider your club uses; the club only sees the type and last four digits.
Removing your card
Remove → Yes, remove. Removing it also turns off automatic renewal on your plans, so they won't renew until you pay or add a card again.