To redeem a voucher, please first put the desired product in the shopping cart. In the next step click on the shopping cart symbol and then on the button "View and edit cart". Then click on the "Apply Discount" button in the shopping cart to open the input field for the voucher code. Now enter your voucher code. Finally, you can redeem your voucher by clicking on the orange "APPLY DISCOUNT" button.
Alternatively, you can redeem a voucher on the "Order summary" page in the checkout area. To do this, click on the "Apply discount" link under the item "Order total". Now enter your voucher code in the text field. Finally, you can redeem your voucher by clicking on the orange colored button "APPLY DISCOUNT".