In the last step of checkout, there is a heading titled "Gift Cards & Promotions". Just under it, you will find a button with the text "Apply a Promo Code". Click on this button, enter the promotional code and then click on "Apply" to enter the code.
Please note that some promotions require you to be signed into your online Rewards account in order to apply it, so make sure that you have signed in prior to checking out. If you are not a member, you can join for free below:
If you are still having issues with your promotional code, reach out to us via our contact form. In the description, please include information about the products that you have in your cart, so that we can assist you better.