Do NOT use chkconfig --del. It will delete all related entries and symbolic links in /etc/rc*.d directories. It is used to remove a service from chkconfig management.
To "stop" kudzu from starting in all running levels, do as root
#chkconfig kudzu off
To "stop" kudzu from starting in level 3, do
#chkconfig --level 3 kudzu off
To "start" kudzu in all levels, do
#chkconfig kudzu on
To "start" kudzu in level 3 only, do
#chkconfig --level 3 kudzu on
It's fine to use GUIs, but don't depend on it too much. When you start to manage lots of systems remotely, GUIs don't help you!! That's why it's essential to understand and master command line operations.
Learn chkconfig, you will appreciate the power of command line.