For instructions on adding members to a Sybase IQ group in Sybase Control Center, see the Sybase Control Center for Sybase IQ online help in SCC or at http://sybooks.sybase.com/nav/summary.do?prod=10680.
SCC provides tools for managing users and groups both for Sybase IQ and for SCC itself. Be sure to find the instructions for Sybase IQ users and groups.