How can I add a member to my Family Plan?
You can only add members that have already created their own free Peak account. Users who have purchased a Pro subscription on their accounts cannot be added to the Family plan.
To add a member, just open the app, go to the Account & Settings menu/gear icon in the sidebar, then tap "Family Plan" and finally "Add new member." You will need to enter the email address associated to their Peak account.
Note also that the login system is case sensitive: if the person you wish to add typed their email address with specific lower and/or uppercase letters, you will need to type it in the same way in the Family Plan menu.