Took about 2 hours to write it all up, including a very very basics how-to in LevelEdit Tutorial (It basically just aids the other tutorial)
Any problems, let me know. Haven't really scanned it for typos, or broken links etc.

http://syckaudio.com/renegade/Tutorials/map-adding_tib_mist-and-lights-lvledit.html

http://syckaudio.com/renegade/Tutorials/LevelEdit_basics.html

Damn, It doesn't work!
I've installed everything as it have to be, but after installing patch, I got a problem:
After I'm opening any map or just start up the Level Edit, it shows me the loading screen for a moment and then shuts down.

Are you sure you're using jonwil's level edit patch? Cuz if you haven't got that, that might be the problem.

I've downloaded everything by links wich are included in that tutorials.