I'm not familiar with PCLinuxOS, but for example, I can find the Lisa settings-area in my 'start' menu, or system menu, and it is in the Networking section.
Another thing to look for is if you have something among your menus called 'Xfce Appfinder' or '<something-else> Appfinder' which locates tools and appliucations on your system and allows you to run them or add them to your system menu.
Also try your system menu updating/editing tool, it also can be used to add stuff to the system menus.
Finally, if this fails, open a console window and type 'man lisa' or 'man -k lisa' or 'apropos lisa' to locate the help pages for the Lisa system.
Best of luck; hopefully other user(s) will have more help, specific to your Linux Distribution.