You can enter your promo code while checking out to pay for your order. After clicking into your cart, you will see your order details, and the "Promo Code" box below your items:
If you already entered in your billing/shipping information before applying your promotion - that's okay! You can still enter your promo code during checkout. You will be prompted under a section titled ENTER GIFT CARD OR PROMO CODES that looks like this:
