If you are paying using PayPal:

You will need to change the credit card from your PayPal Account settings.

Here’s a tutorial from PayPal on how to do that: How do I link, remove or update a card?

If you are paying using Credit Card directly:

We don’t support setting up subscriptions when paying using credit cards, Just make another payment using the new card you want.

Here’s a tutorial on how to pay using Credit Card: Can I Pay Using Credit Card?