To add users to an OIT Sympa mailing list (lists.gatech.edu), you need to be a priviliged owner.  To add users, perform the following steps:

1. Log into Sympa.
2. Choose the list you wish to update from the choices along the left and click the admin button.
3. Under Admin, click Edit List Config.
4. Click List Definition.
5. Find the header for the role you want to assign (owner, moderator).  At the bottom of the section will be an area where you can add a new user.

You must use the published email address for the user you wish to add  You can check for the user's published email using Georgia Tech's Directory Search.