You can apply valid coupons in two spots on our store.
1) On the Cart Page
On the View Cart page, click the "Have a coupon code?" option under the Continue Shopping button. Enter the coupon and click "Apply". If the coupon is valid and your order meets the requirements for the discount it will apply to your cart.
2) On the Checkout Page
During checkout for your order, you will see the cart summary on the right (it is minimized when shopping on a mobile device). Click "Coupon/Gift Certificate". Add your coupon and click "Apply". If the coupon is valid and your order meets the requirements for the discount it will apply to your cart.