Tap on the chart to bring up the Player controls, then the bottom right icon to turn on the Piano/Guitar/Ukulele chords and Chord Scales. 

After you selected the Chord diagram type, tap the bottom right icon again to hide it.

 

 

Tap and hold a measure (bar) to see the fingerings/voicing.

Example showing Piano, one hand:

 

 

 Tap on the chord diagram and swipe it to the left to select a different inversion.

Example showing a one of the guitar diagrams for two chords in the bar:

 

Note: Guitar or Ukulele diagrams reversed