Go to Course > Course Set up > Instructor Group

Check to see if the Instructor Group already exists

Look for the Group with Internet Browser's "Find" tool, usually "Ctrl-F" for FireFox or Google Chrome on a PC.

Type Location Name in Text Box

If Instructor Group Exists, click edit

Under Group Members, search for the User in text box, Click "Search", Then "Select user"

Click "Save" Button