To update your billing information that appears on the invoices:
Please note that you can not update the billing address for invoices already issued, only for the future once. Therefore, when buying a PRO subscription, be sure to enter your details correctly for the first invoice;)
Go to Billing
Change the billing address
Click "Update"
To change or update expired credit card
Go to Billing
Click "Manage Subscription"
Update your credit card on the following screen