Redeeming a John Green promo code is quite easy. Just follow these steps:
Select the desired voucher code or special offer
You will be automatically redirected to the John Greed website
Add your chosen items to the shopping basket and proceed to checkout
Look for the "I have a promo code" option and click on the "Click to enter promo code" link
Paste the copied voucher code into the provided box
Click "Apply" to see the updated total reflecting the discount