Certain offers will state that with a promo code—or series of letters and numbers, which the offer will state—you can redeem the offer.
This promo code should be entered in the "Promo Code" section of your cart, found on the righthand side of your screen. Once you hit "Apply," you'll want to make sure you see on-screen confirmation of the promo code having been successfully applied.
The promo code will be applied to your cart if you meet the eligibility criteria for the promotion. Please note: if you make any changes to your cart or in the future to your account that make you ineligible for the promotion, your promo credits will be removed.