Basically, in order to change the credit card details, you need to renew your subscription. We recommend doing so a few days before the subscription end.
Here's the instruction:
1. Open your subscription page (credit card icon located at the bottom-left corner)
2. Click Renew
3. Click Pay for subscription
4. Now you will be redirected to the payment website → Here you can provide a new credit card details.
See also:
What payment methods do you offer?
Do you have an auto-renewal system?