On you Studio Dashboard, click Teachers:

Next, click Add a Teacher to open the teacher form:

Fill in teacher details then click Add Teacher:

The new teacher has been added to LessonMate!

When you add a new teacher they automatically receive a welcome email with their sign in details and a link to the Teacher Introduction help section. Read more about that here: http://help.lessonmate.org/en/articles/482330-how-teachers-learn-about-lessonmate