It´s easy.
1. Click in the editor :new file (file registry).
2. When you have the new file click in the file registry: Import (here you get a warning that should not confuse you)
3. Import the rules and players by clicking on these boxes (don´t click on the box "map!)
4.Save the new scenario with the function in the file registry: "Save as" under the new name you give to your random map scenario. You must ensure, that your new created biq is either in the scenarios or conquest folder. If the biq is in the scenarios folder, start it with the menue under the "content button". If the biq is in the conquests folder, start it with the menue under the "conquests button".