To add existing educators at your school to a class:
Under the MANAGE section, click on "Classes"
Select the class you want to add educators to
Click "Add Educators"
The "Select Existing" tab will be open by default
Check the boxes next to the educators you want to add
Click "Done Adding Educators"
If you can't find an educator, they may not be registered at your school yet. You can switch to the "Invite New" tab to invite them.