Select the corresponding offer for your chosen voucher and click "Add to Bag". You may also shop for other items you want.
When you're done shopping and ready to checkout simply hover your mouse over "My Bag" found at the top right corner of the page and click "Secure Checkout".
Review your order.
Just below your shopping bag you will see "Do you have a promotional code" and a box where you can type in or paste your voucher code. Click "Apply" after entering the code and your subtotal will be adjusted accordingly.
Click "Go to Checkout" and enter your email and password if you're a returning customer or just your email address if you're a new customer and click "Continue" to proceed.