After you've added all the things you want to your cart, it's time to check out! On the checkout page, you'll be asked to enter your email, shipping, and payment information. But before you do that, don't forget to add your coupon code! Just look for the blue link for "Coupon/Gift Certificate" and enter your code in the text box. Then click "Apply" and watch your savings magically appear!
If you're on mobile, you'll need to fill in your member, shipping, and billing information first. Then, scroll down to the "Payment" information section. At the bottom of the page, you'll see the blue link for "Coupon/Gift Certificate". Just enter your code and click "Apply" to save some money on your purchase.