You can either use the KDE Kiosk Tool (
http://extragear.kde.org/apps/kiosktool/) or make changes to the KDE config files manually. Start with the kiosktool. Down the code, compile it as root, and run it as root, then setup a profile, and then assign the user(s) you want to that profile, and that's all!! Kiosktool will create KDE config files in /etc/kde-profiles and you can see them (they're text files) in /etc/kde-profiles/share/config (careful: some distros such as Suse put the files in /opt/kde3/share/config)