How do I use musicbrainz? How do I get MBID? How do I use acousticbrainz plugins? How to use lastfm plugin?

Okay, my english might be too broken so Ill try to make it simple.
Some my music is NOT identified with Picard. I pressed all buttons no new tags appear. My tracks are NOT in musicbrainz data. How do I use acousticbrainz plugins for those tracks??

now some broken english part exuse me

I didn’t mean that, I meant if track is in Picard database it probably already has all the tags by community. Why limit acousticbrainz analysis to tracks that only are in musicbrainz database? I think Im missing something important
dns_server’s answer requers “musicbrainz recording id” but how do I get it if my music is not identified?? For me it sounds like: to upload new song to database you need to get this song’s recording id (or whatever id), to get that id you need to have song in database. wot?