Once you know the promo code, sign in to your ShippingCart account and review your package information. Make sure that the promo code is applicable to the payment method that you'll be selecting. When you're ready to pay, enter the promo code in the field provided. If entered correctly and within the promo duration and requirements, your shipping fee will reflect the discounted amount. Click Pay and Ship.
Please make sure there are no spaces before or after the promo code to avoid errors.