If you have a valid coupon code, you can enter it in the coupon code box on the checkout page to receive your discount. The coupon code box is located on the checkout page above the Payment Method section (Click to see an example). You can then enter the coupon code and press the Apply button. If the code has worked then you will see the words "Coupon accepted" appear next to the box. You will then see the discount added to your Order Contents at the bottom of the checkout page, and you can proceed to enter your payment details.