If the order has not been authorized yet for production, you can edit the details of the order from your account. This includes being able to change the quantity, paper-type, shipping address, etc.. Please note that if you edit the quantity, you will have to recalculate your shipping as the weight or price may change. For orders that have already been authorized for production or are in production, you will need to contact our support team directly to see if it is still possible to make a change. We cannot guarantee that any changes can be made once an order is finalized.