It's really easy!
HOW DO I REDEEM A VOUCHER / DISCOUNT / COUPON CODE ?
Place your order
Go to cart and checkout
When entering your personal information & delivery address you will see a large column on the right hand side of the screen
Here you will see an area to fill in your discount code and an apply button
(a) Enter your code here (b) click the apply button (c) your discount code will apply and your total will change
The image below shows where you should be inputting your discount code.