How do I add students to an existing section?
To add students to an existing section, click the "Invite more students" button and type in the name of the section you want to add students to. Make sure you are typing the exact same name. Then click "Show link" and send that link to the students you want to add.
Alternatively, you can also tell your students to go into their Settings on their Duolingo account, and click on the "Progress sharing" tab. They can then type in your email address (make sure its the same email address your Duolingo account is tied to).
Hope this helps!