As a teacher, use your login details to log into the student environment via the website (lessonup.app), or the LessonUp app.
You can then add yourself to one or more classes. Do this as a student would, by using the class code (via: My Classes).
In the student area you will see which classes and courses you have been added to.
This way you have more grip on shared learning material, and can quickly discover possible mistakes (for example in a test).
Practice teaching your lesson (Teach button) to experience directly what your students see.