Need to change the quantity ordered? If so, simply email your client service rep, who will edit your order accordingly. An addition to the quantity ordered will result in an additional billing. Since we do not store your credit card information, we will need your credit card information to process the additional charge. Simply add your credit card to your account (see information on how to do so here) or request that your client service rep send you a PayPal invoice. If you want to change the quantity ordered to a lesser number, we will credit your credit card back for the difference in price.
If your order has already shipped, you will need to place another order for the additional quantity. You can do that by reordering. (See information on how to do that here.)