At each site, one or more people are designated as the owners of the site's email list. These owners manage who is a part of firstname.lastname@example.org, for example. Each year, staff need added and removed at each site to keep the list accurate. If you are a designated owner, follow this process to make updates. If you personally need removed from or added to a site's list, please contact that site.
Find the Group:
Click the Apps grid, select Groups or browse to groups.google.com
Click on My Groups link
Click on the Group Name (SiteName)
Over on the right side, click Manage
Click Direct add members in the left hand menu (under Members)
Enter Email addresses separated by commas
No welcome message necessary
Click Add near the top.
Click box next to name of user to be removed.
Click Actions button, then Remove from group
Click Remove button to confirm