Select folders that contains your karaoke songs (midi, mp3, mp4, mkv, vob, ...)
If you use old files (those require text-encoding setting, usually midi file), click on the folder contains those files, then check "Show more options for selected folder", and select proper text-encoding for karaoke file in that folder (see more: Database)
Click scan all to scan for songs
3. Search song and start singing
In main window, click on Library, and search by typing in searchbox
Search results are shown as you are typing (instant search)
You can search for "Happy new year" just by typing "hny" (first letter of each word)