How to use COUPONS:
1.) Copy the code from the box above and then go to greendust.com
2.) When you have chosen a product/s that you want to purchase,
you can add them to your cart or proceed to checkout.
Once on checkout or cart, look for either:
"promo code", "apply discount", "coupon code", "code" then click on it.
3.) Paste the coupon code on the field provided then click on APPPLY.