Use the Roster tab to view your students within a course or section. Locate the student you wish to tag, click the settings menu in the last column of the table, and select the Set Tag option for that student.
To remove a previously added set tag, click the close symbol. To add a new tag, type your tag in the Tag box. It will look for a suitable match based on your search, which will enable your tags to be consistent across multiple students.
If no match is found, click enter and then click the Save button.