1. On the home screen, click on the downward-facing arrow icon in the upper right corner.
2. Click "Invite Members"
3. Click to "Add Mobile User".
4. You can either choose a contact from your phone book, or you can click "Enter Manually."
5. Fill in the required fields (if you choose a contact that is already in your phone book, their details will be automatically entered). After you're done, click "Invite member".
6. An invitation to join your family will be sent to the e-mail address you provided.