Need help in how to use "Space Trailer" for FCPX

I see more templates, and other sources for use in other software other than for FCPX or for Affinity Photo, Affinity Design, Affinity Publisher. I want to create a movie trailer in FCPX, found on called, “Space Trailer”. I chose the FCPX folder and it took me to Motion. Can anyone show me how to use this? Keep it simple for me. Thank you