If you go into the main folder of Ship Simulator extremes and click on Projects/Ship Simulator Extremes/Docs in that order you will find the manuals for the game and for the editor. In addition I am sure you will find the following link to information provided by Mark most helpful.
http://80.95.161.114/shipsim/forum/index.php/topic,21468.0.html
You can also find a wealth of information in the posts in heavy blue type at the top of the Missions Board.
Traddles.