If the Squad member already has an account with the same email address you added to your host portal, they will receive a notification in their SuperBetter app, and see the invitation in the Explore section of their Discover tab. If they have not yet created a SuperBetter account, or if they have a SuperBetter account under a different email address, they will receive the invitation by email, with a link to create their SuperBetter account. Squad members can play Squad Challenges on a free Player account.