Once you are logged into your client portal, if you have permissions to the billing options for your company, you will see a link labeled "Manage Payment Methods" at the bottom, left hand side of the interface.

Once you click the link, a new screen will appear.

To edit an existing payment method (update address, expirations, etc.) click the  button located in line with the chosen method of payment. To mark a different payment as the primary method you would like Cool Life to charge, click the radio button for that method of payment.