In order to obtain the instructor icon you must be inducted into the Professional Exchange Program (please see link). You must contact VA-gunnut and provide him with documentation and bonafides.
http://www.ar15.com/forums/t_9_1/225363_Professional_Exchange_Program.html
In order to post classes you must be a member of the Professional Exchange Program. Course postings are limited to the
Tactical Training forum. Any courses posted in any other
Training forum will be locked and trashed.
Pro Exchange members may still post once a month in their HTF.