I didn't realize the removed the legacy pages for freenas7 to nas4free, nas4free is still 7 so you want this one: http://wiki.nas4free.org/doku.php
read the download options, just takes a moment.
you can put minidlna on it as well, but i don't believe it comes natively. shouldn't be a problem or even a hassle.
Never look a gift Lion in the mouth.