All you have to do is download a ship, drag the .pop file to your desktop, and load it in game. It's as easy as that! If you would like to share your ship, all you have to do is save it to the desktop, and share the .pop file. ALWAYS make sure the filename is "CustomShip" or else it won't load! You can download some ships I've made below:
If you have any issues trying to load in ships, or would like to show off your own spacecrafts for others to download, please leave a comment!