Unfortunately it is not possible to cancel, add or change anything in your order, including changing payment methods or shipping information of any kind. This is because we reserve your items and start processing your order shortly after you place it.
However, if you have made a mistake or accidentally placed a duplicate order there is a 1-hour window where you can request to cancel your order. If the order has already been shipped or 60-minutes have passed, you'll need to follow our returns process.