Click on the Mailing Lists link 
in the Mail Menu area.
Click on the edit button 
.
Log in to the mailing list with your password. You are now in the Mailman Administration panel and can adjust options as you require.
There are many different configurable options available with the Mailman script. This procedure shows you how to open up the Administration panel so that you can modify the script options. Use the Mailman documentation that is included in the Administration panel to answer any specific questions you might have.
To edit a mailing list:
Click on the Mailing Lists link
in the Mail Menu area.
Click on the edit button .
Log in to the mailing list with your password. You are now in the Mailman Administration panel and can adjust options as you require.
You can also login to your mailman admin area by going to this url:
http://yourdomain.com/mailman/admin/name-of-your-list_yourdomain.com
replacing of course yourdomain.com with your actual domain name and name-of-your-list
with the actual name of your list.