When you go to check out on our website, there will be a box above the billing and shipping details that will ask if you have a coupon code. When you click this box, another text box will drop down where you can add your code. Once your code is entered, there is a button to the right of it that says "apply coupon". Once this is clicked, your coupon code will be redeemed and active for this purchase. Note the coupon will not be used until the purchase is completed.