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Click on your username on the top right corner menu and select Billing.
On the billing page, you will see the Make a Payment box. Enter the amount you want to credit your account with and choose Pay.
Any overpayment shows up in your account balance.
On the billing page, click Update Credit Card and input your new credit card information.
Please note that we do not store any credit card information. We use Stripe as a payment processor. Your credit card information is passed directly to Stripe without ever reaching our servers.