Open editor and click on button "Set game path"
Find "FiNCK.exe" on your disc, then click on it and click on "Open" button
If you use portable version of the game, edit the Editor.ini file, which you can find in same folder as Editor.exe
When you use flash disc use ".." to set the adress
I have Editor in same folder as FiNCK.exe.
And the Editor.ini looks like this:
[General]
Game Path=FiNCK.exe