Once you have filled up your cart with all the products that you need including a self-tan back applicator called the Skinny Tan boots, serum, or oil, click the cart at the top of the page to proceed. You will reach the sign-in page. If you don't have an account or don't want to create one, click on "continue as a guest". Add all your personal and billing information on the contact page and look for the "Coupon Code" form in the middle of the order summary. Add your copied code here and apply it. You will see a price drop in your total cost. Hit check out and enjoy.