Once you've finished shopping and have added your items to your bag, click the bag icon on the top right hand side of the page.
On the 'My Bag' page, directly under your items and to the right of the delivery information, you'll spot the 'Enter promotion code' box. Once you've entered the code an clicked 'Apply', this discount will be applied and you can see how this changes the order total.
If the code isn't valid for your order or has expired for example, you will see a red message under the promo code box that lets you know it didn't go through. If you need help with your discount code please contact us.