Changing user login groups
select a user name,
then select Modify from the Users menu.
Use the Change Group Membership button
to change the value in the ``Login Group'' field.
The login group is the default group to which the user belongs. Files and directories created by the user are owned by this group. Users can temporarily change their login group using the sg(C) command.
To change the system default login group, select User Defaults from the Options menu.