After adding your items to your cart & logging into your account, you'll be taken to the payment information screen. On the right-hand side, you'll see a summary of your items. Under this, there is a field for 'discount code' (as shown below). Simply enter the coupon code in this field & hit 'Apply'. Please note, only one coupon code can be used per transaction and to ensure you type the coupon code exactly as it appears as this is case sensitive.