Coupons and Discounts
Some sites will offer promotions by way of coupons or discounts. If you have a coupon, you can redeem it after you've done all of your shopping, just:
Click the Discount set buttonAfter you have done all your shopping, click the grey Redeem button in the Order Window just to the right of where it says Discount.
Copy/Paste in your discount codeEnter your discount in the box marked code and click the orange Redeem button.
Success!You should now see your Discount and the new Total reflected in the Order Summary.
If you later add more items to your cart be sure to repeat step 1, your coupon/discount code will still be there, so you can just hit done to re-apply it.