In order to make changes to your payment method(s) on file, please navigate to the top-left dropdown menu and choose "Billing". On the following page, in the "Payment Method" section, you will be able to toggle between your default payment method, remove a payment method, or add a new one.
At least one payment method
Please note that in order to prevent unexpected service disruption, the only payment method on file cannot be deleted. Once at least two payment methods are added to your account, one payment method can be deleted safely.