Friends on Duo
How can I follow my students so that we became friends on Duolingo?
Go to their profile and click "Follow".
You can search for their email by going to the Home tab where it appears in the blue bar at the top of the screen. Scroll down to the bottom of the leaderboard and click Search.
Also, if you know their usernames, you can type them in, one at a time, at the end of the main link and it will take you to their profiles. For example, the link to your profile is http://www.duolingo.com/Milena_Miller
If you've already added them to a class, you can click their username link where it appears in your class and use that to go to their profile. I hope that helps!