[otrs] How to delete users, groups and services in Web interface

Hi, Somebody knows how to delete users, groups and services in Web Interface? Is there any module available for this? Thanks, Camilo Vieira * Infra-estrutura de redes * 55 11 7643-4895 Navita http://www.navita.com.br/ * Portais http://www.navitaportal.com/ e BlackBerry http://www.blackberrycorporativo.com.br/ * 55 11 3897-3797