Click the "members" icon at the top right of the channel.
Click the blue "+add" button at the bottom of the pop up.
Add your students emails into the text box.
Click "add users".
Your students will receive two emails–a welcome email, and a temporary password email.
To log in, they will need to go to [yourschool].nectir.io (e.g., usq.nectir.io) and use their school email (e.g., [email protected]) along with their temporary password.
Once they've logged in, they will be prompted to create a new password of their choosing.
And you're done!