Please click your name in the upper right corner of the page and click Billing & Invoices in the menu. You will see a button that you can use to change your credit card details.
If you have more than one subscription, then please note that changing the credit card on one subscription does not automatically change it on your other subscriptions. You must change the credit card details of each subscription separately.
If you're paying with PayPal, then you need to log in to your PayPal account and change the funding source of the subscription to reflect the new credit card details.
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