Go into global script -> 01_Variables
you will see a string with many names of spaceship in it, simply input your space ship name with the .ship. First one should be your space craft, the rest are the others.
Also if you want more than 4 ships at once, go into view -> timer and remove the "//" that comments out createactors functions
ALSO, if you want to change what space craft do, check out the AI system in the global script and change it in the draw actor of the first space ship, as all other space ship will hold the same script, except they hold different value on a certain variable