After adding products to your cart, before proceeding to checkout and selecting payment method you will notice a message box below your items. It will mention "Redeem discount coupon". Enter a code and system will calculate necessary discount before proceeding to payment method. You can also find a page wihere you can redeem a coupon by clicking on the "View cart" link on the top right. If you have any problems, feel free to call me. Fred 443 -870-3432