To add a discount code to your order, simply click the button in the shopping cart which states, 'Do you have a discount code?' as shown below.
Once you have clicked on the link, a box will appear for you to type in your discount code. Enter your discount code and click 'Apply Coupon'. If you're having issues applying the code, please see on trouble shooting discount codes.
Please note: Discount codes are not applicable to subscriptions. The following demonstrates the steps for a desktop / tablet device only. Mobile devices have the discount code box visible at the bottom of the shopping cart.