To Redeem a voucher, go to the orders tab on the left of your dashboard.
You will now see the most recent orders. To find a specific voucher, enter the voucher/order number into the search bar (other fields are available through the ‘filters’ dropdown).
Once the voucher/order number appears in the list, you can then click on it to expand the order.
Once this has been clicked, the voucher has been redeemed.