Promo codes/discount codes need to be entered exactly as they are given without a space. Promo codes can be entered at the checkout in the “Order Summary” section. Add the promo code to your order by clicking on “Apply”. After the promo code has been applied to your order, the total cost of your order will change and reflect this code. You can only add one promo code to your order. Promo codes can be used only one time per customer.