To update your card info:
Go to FastPrayGive.org website and scroll all the way to the bottom of the page to login. A “lost your password?” feature is provided:

What it looks like if already logged in

If you are not logged in

Click on the Recurring Donations tab (1) and then the Managed Subscriptions link (2).
Update your payment details in the box provided.
If you have any questions or issues email us at admin@FastPrayGive.org