It's very simple to update your Credit Card Information:
1) Login to your Members area by Clicking here and entering your Login Details!
2) Click on the "Business Center" option in the Menu Bar.
3) Click on the "My Account" button in the Business Center.
4) Click on "Update Billing Details" next to your subscription plan under the "Subscriptions" tab.
5) Enter your new Billing Details and Click on "Update".