Before removing a user from a group, make sure that the user is assigned to at least one other group. A user must be assigned to at least one group at all times.
Note: You cannot remove a user from all groups when multiple users are updating group membership at the same time.
To remove a user, select either the group you want to remove the user from or select the user you want to remove.
If you...
Then...
Select the group
In the Members/Non-Members list on the General tab, clear the check box next to the user's name.
Select the user
In the Members box on the General tab, clear the check box next to the group's name.