I truly can't find it anywhere. Perhaps because when I first installed it, I deleted the public folder, I'm not sure.
I'm referring to this article: http://recovermydrive.com/use-dropbox-to-make-files-public-in-two-clicks/
Where you need your database ID. I can't find it. Is there any way to recover it? I've tried creating a map name 'Public', but that didn't work.