You can add or remove payment methods at Profile > Payments and payouts > Payment methods. Payment methods are stored credit cards which will automatically be charged when you place an order.
Adding payment methods
Navigate to Profile > Payments and payouts > Payment methods > Add payment method and fill in the required information.
Removing payment methods
Navigate to Profile > Payments and payouts > Payment methods and tap on the payment method you want to delete. You will find a “Delete” button on the following screen.
Setting a payment method as default
Navigate to Profile > Payments and payouts > Payment methods and tap on the payment method you want to Set as default. You will find a “Set as default” toggle on the following screen.