You may delete posted messages on your virtual office hour bulletin board.
To do so, go to the URL for your classpage:http://www.math.edu/classes/math/yearquarter/course#.lecture#.yearquarter/voh/wwwadmin.cgi
The easiest way to do this is to go to your virtual office hour page, and in the location box add after voh/
wwwadmin.cgi
This will bring up a new page where you can remove files in various ways. Click on the way in which you want to delete messages. This will bring up another page. It should be easy for you to proceed from here if you can fill in the required username and password. If you wish to obtain these, see one of the computer consultants during regular consulting hours.