Be careful what you do with the Script Editor as it may have unwanted results on your game.

Navigate to the pilot name change menu and enter the following (Note the capital 'T'. Your name will not change afterwards.):

To activate the built-map editor, change your pilot's name to "Makeanapplepiefromscratch"! If all done correctly, the map editor activated, and the name of the pilot will remain the same. To enter the map editor exit to the main game menu, select New Game, and in the bottom of the list will be item Galaxy Editor.