First what you must know, is how to setup nav items - especially APT, RWY and ILS. Look at user guide or videoguide. The easiest way is using Google Earth.
http://funair.cz/forum/viewforum.php?f=11I recomend:
1. Open Nav item ilst and create folder in root - for example My Airports and open it
2. For each airport create its own folder (inside folder My Airports)
3. For each RWY create "RWY" or "ILS" item, at the center of the airport create one "APT" item. Do not forget to fill ICAO code, because via ICAO code items are connected to VHF.
4. When edditing nav item press VHF button and you will see VHFs list.
5. Press Menu/Add VHF