Just click Generate, and you'll get a packed file which contains the course .map files, and the txt file describing the course. Unpack the files into the neverputt data-dir.
You will have to compile the map-files into sol-files with the mapc-program that comes with neverputt.
For example on linux you could do
for x in data/rndmap-12345/*.map; do ./mapc "$x" data; done
NOTE: The course generation will take a few seconds, so wait for the script to finish instead of clicking several times on the button.