After you have finished selecting and editing your product and have clicked next you will move to the Print Item/s in Cart screen. This will show the value of your purchase at our regular low price.
Click on the Shopping Cart button and proceed through to the Invoice screen. Click on the drop down menu below Promotions Available and click on the Use Coupon Code.
Enter the promotion code in to the box beside Enter Promotion Code and press apply. If you have entered the code correctly and met the criteria for quantity and/or product you will see the price change against the product applicable.