You'll have to tell the editor where the compile tools are. These will make your map compile to a bsp.file, then it needs a vising for clearing, and a light tool to make things glare.

These files you can find:
here.

After redirecting Trenchboom, see Preferences you can lead these file to your map.

Sounds simpel, just see for the manual of Trenchboom, I think. 

See the manual for info. Also such questions usually g onto the mapping help thread.