To make a map public/up for download, in map maker, for the wanted map press export and wait for it to export all the map files. Then go into your Feralheart folder>Exports. If you've already downloaded maps that are in there, move then aside before exporting so you don't have to sort them out or something. >.< But so take all the map files, and out then put then in a ZIP file and go onto a file sharing website such as Mediafire and upload them!
Sorry if my description was confusing, I typed pretty quick.