I registered for a Waitlist/Lottery, and I need to update my payment method.

You can only add payment methods when checking out, but you can remove them at any time.

You can remove your payment profiles(s) here:
https://ultrasignup.com/members/wallet.aspx

If you are chosen for a waitlist or lottery, and your original card is declined, you will receive instructions on how to update your payment method in your confirmation email.