Hello, some discount codes you can use on subscription orders and some you cannot, it all depends on the offer and if it is exclusive to one-time purchase or if the discount is stackable on subscription discounts. Look at the discount code info on the email/sms that you got it from for additional information if you are not sure.Our first time order discounts, new meal launch discounts and holiday discounts are generally valid on both one-time and subscription orders.  If you use the codes on a subscription purchase it will work on one subscription order...i.e you get your 20% off subscription discount, and the applied additional one-time discount for a combined bigger discount. Then when you get sent your next subscription order you will still receive the 20% subscription discount but not the additional discount you got on the first order.To apply a discount code, simply copy & paste your gift card code into the 'discounts/gift cards' box on the checkout, your discount amount will be applied against your total and you will only need to pay for the balance.If you need any additional help please reach out to our customer care team at hello@eatpropergood.com :-)