If you need to change your credit card number, there are two main ways as demonstrated in this quick screencast....from a coffee shop. When you next pay for pickup hockey, simply select "change" on your payment screen and follow the steps.
As well, you can go into your profile and ask that we delete your current credit card. That should require that you enter a new one next time you play.
To clarify, we store no credit card information anywhere on our servers. We integrate with our partner Stripe so that they handle all that.