Lucky you and thank you for spreading the word about graze!
You should have received an email that looks a bit like this: “John S. has just joined graze. You’ve earned a reward!” If you haven’t received this it may have gone into your spam or junk folder.
In this email you’ll see which of your friends has used your code to sign up and then a green "redeem my reward” button . Click on this and the discount will automatically be added to your account and used on your next box. You can then see this on your graze payments page.
You can also keep an eye on how many free boxes you’ve unlocked on this page of your account.