Choose a class in the class filter to the top left and go to the Students tab.

Go to Settings and click Share class.

Here you will find a list of the teachers working at your school.

Choose which teacher/teachers to share the class with by clicking on their name, and click Save.

You can also share a class by going to the Classes tab, clicking the three dots in the top right of the class, and then Share with teachers.

Done!😄