Login to your account, then go to your "Account" section. In this area it has areas where you can see or modify all of your account information, including your payment methods. Go into the payment methods and make your changes there; make sure to "Save" it when you are done making the changes.
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Login to your account, then go to your "Account" section. In this area it has areas where you can see or modify all of your account information, including your payment methods. Go into the payment methods and make your changes there; make sure to "Save" it when you are done making the changes.