You can invite a teacher when you have groups created.
If you haven't done it yet, take a look at the guide here.
The teacher-role in TinyApp is targeted for all kindergarten personnel who work with children in the groups.
1. From the "Teachers" menu, select "List" and "Invite Teacher".
2. Enter the teacher's email address, select the language you want to send the invitation, and the group(s) to which the teacher belongs. When you save the information, an invitation will be sent to the teacher via email.
3. Repeat for all teachers. You will see all the invited teachers on the list and whether they have activated their user account.
Next, add the children to the groups and the guardians to the children 's information.
See instructions here.