Here are the steps on how to use Promo Codes when shopping at simplehuman.com: Sign in to your simplehuman.com account, if you don't already have one, you will need to create a new Simplehuman account. Then, add the selected items to the shopping cart. Then, click Pay to enter the payment page, you can see the prompt [Use your Coupon Codes], check the Simplehuman Coupons of your choice, and then return to the checkout page and click Pay.