Keyboard maps in KDE Control Center

Hi, I have an Internet Navigator Keyboard connected to a Dell Laptop. In the KDE Control Center I chose use Keyboard Layout and chose the Internet Navigator keyboard. That works fine so far. Now I would like to also add a mapping for the keys on my laptop. Where do I find the mapping for the Internet Navigator Keyboard and how can I modify it? Where are the mappings for Keyboard layouts stored in KDE? Thank you Sebastian