After adding items to your cart, click the “Cart” link at the top right side of this site to view your cart. Once you proceed to checkout by clicking the “Checkout” button, you will need to either enter your account information or continue as a quest. Next, you will be brought to a page to enter your email and billing address. On the next page, you will see a box that says “Discounts: Have a discount code? Enter it here:” Enter your coupon/discount code in the field below and click “Apply.”