You will first need to download a program called ''mcedit'' (https://www.mcedit.net/).
Once you downloaded it, you have to run it and then you will be able to
select one of your worlds/save files. When you selected the world you
want, you can navigate through it with the camera using your mouse and
the wasd keys. Once you've reached the spot where you want the schematic
(in this case the ship) to be placed, you have to go on the top row and
find the ''Import/Export'' square and select import, this will allow
you to open the schematic file you downloaded and place it in your world
wherever you want.

Here's a more in depth guide if you need it: www.youtube.com/watch?v=vPflc8htR7c.