I work on a windows computer so ill tell you how to get it from one of those.  Go into libraries in the search bar up near the top (the one that resembles a http:// bar) type in %appdata%.  Once you do that press enter and navigate to the folder that is titled .minecraft, then go into that and you should see more folders, go into the one one that says "saves" and find your world.  Now you will need two things at this point:  A file sharing site, like Mediafire, or Dropbox, and you will need to download Winrar or 7zip.  One you have Winrar or 7zip installed, right click on the world save folder in the saves folder itself, and click add to archive.  One you find your file, drag and dop it into the file sharing site and once that is done, copy and paste the URL of the download link and paste it in this project details, labeled "world save".  once you do that you are done!

Thanls

Working on it

Thank you Ivain!