How do I get the Auto Harmonize to work?

Select Auto Harmonize

Select either Casio Chord or Fingered Chord

Select the Rhythm to be used during Auto Accompaniment

Press Start/Stop

Play a Chord; one finger (if Casio Chord) on the left hand below where is shows CHORD, or three fingers if Fingered Chord

With the right hand, play a note, you will see a note will be added.