The command from the menu is "systemsettings -caption %c %i", but within Knoppix there are no declarations for %c and %i. Use only "systemsettings".

http://superuser.com/questions/32087...-kubuntu-11-04

Be aware, Knoppix uses LXDE based on Gnome. Many of the systemsettings of KDE will not work with Knoppix.