Follow the steps below

1. Click on Classes

2. Click on the Action button on the class you wish to assign a subject teacher to (use the search box if the class is not in the display).

3. Select View Class.

4. Click on Subjects.

5. Click on Assign Teacher.

6. On the modal, click on the Select Teacher box to select the teacher's name (you can select more than one name)

7. Click on Save