Scraping mood for music

Hi all,

I searched and didn't find the answer.
I read here that the Universal Scraper for Music Albums uses allmusic.com and also scrapes Mood tag.
I used it but I don't see Mood in the music library options.
I also tried a suggestion I stumbled upon of using the smart playlist, but it couldn't browse for known moods.

So in the link above also says:

Quote:In case allmusic link is not added on the MusicBrainz site, fields from allmusic.com cannot be fetched (very easy to add those missing links though).

What does that mean exactly? how do I add the link?
BTW, I don't have MusicBrainz installed on my PC.

I use Kodi V15.2 Isengard.

Thank you