To use a promotional code on Amazon.com, add all items that are part of the deal to your cart, and proceed to the checkout screen. Type the promo code into the promo code box on the Place Your Order Page, and click Apply. Enter your credit card information to cover the remaining balance, and submit your order.
You must add all items involved in the promo code to the cart as if you are buying them, even if one of the items is free with the code. If you don't add the free item to your cart, you won't receive it even if you enter the promo code. Verify that all products are in the cart and that they match the terms of the promo code exactly.
Copy and paste or write down the promo code exactly as it appears on the screen. Enter the promo code exactly in the box to ensure it works properly. After you click the Apply button, review the page to ensure the promo code discount was applied. If the discount isn't applied correctly, verify that you added the correct items to your cart and entered the correct promo code. Unique promo codes are only available for one use, so the code won't work a second time if you already redeemed it.