The icon, of a group means that the user can change the list of users included into the group. This permission can be given by the system administrator. To edit a list of members of the group, click on its name.
Editing the group members
As mentioned above, to edit group members you should click on the name of the group.
The edit page contains the list of users in the group. Members marked with iconin the "Manager" column have the right to modify the list of group members.
To remove a user from the group, click , which appears when you hover the mouse over the user row.
To add a user to a group, click Add user to group. This will open a list of users for selection.