O2 open family discount

[Cheesefest]

when signing up to o2 open, it states that family can take advantage of the discount as well using a code on the o2 open login page. But when I log in to it, there are no codes to use. My wife and I recently got new refresh contracts and we would like to take advantage of the discount

[Bambino]

@Cheesefest See if this link helps: https://www.o2.co.uk/family-plan