How can I do to show that space ships in my space engine?
There are a few threads and many posts about it already. First, just look at your readme file in the SpaceEngine folder to see the controls. To actually see the ships, all you need to do is access the ships menu with the pop-out interface on the left of the screen or with Ctrl-F3. Then select a ship and exit the interface and hit G like with any other object, or use either Switch To or Teleport Here (switch to brings you to the ship and puts you in control of it). Make sure that time is not paused and that you are inside a star system.