To invite other users to join your tado° Home, follow these steps in the mobile app:
Go to Settings > People.
Select Invite People to Join Home.
Enter the email address of the new user and select Invite. They'll then receive an email invitation to join your Home. As soon as they accept, they’ll be able to use the tado° app.
You can also set up tado° to work for residents without a smartphone, guests or household helpers who visit you regularly.
More information:
How can I remove a user from my tado° Home?