Do you want to change your default payment card? You can easily mange your payment method on Customer portal.
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After logging in into customer portal, click the billing button to expand the billing-related menus.
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Click the Set up Autopay button.
On the Setup autopay screen, all payment information you have registered is displayed as a list. Among the payment information, the actual payment will be made with the payment information marked 'Default'.
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Click ellipsis button on the right of the payment method which you want to select for your payment default card.
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Click 'Set Default' button.
If you could see the 'Default' status right of the card, all the process had finished.