At checkout you have the option to add your gift card or discount code to your order. This section can be found on the right hand side of the page on a desktop or by clicking Show Order Summary on mobiles. Only one discount can be redeemed per order, but a discount code and gift card can be used together on a single purchase. If you have a discount code personally assigned to you, this will not be automatically added, you will need to add this manually in the discount code section.