If you have a referral discount from a friend, or a promotional code for a discount on your first box, there are a couple of ways to apply this.You can add it directly into the weblink when you go to our website and the discount will be applied automatically e.g. www.butternutbox.com/NAME123Or, you can click 'Build Your Box' on the homepage and fill out your dog's details first. Before you get to the final checkout, you will see a breakdown of your plan price and the option to add a referral or promo code.Once you apply this, the discounted price will be displayed at the checkout. Good stuff.