Select the desired chord in the scrolling text field. The fingering will automatically be displayed on the frets. For OPEN chords, blackened dot-circles above the nut indicate open strings. For ANY chord, moreover, strings with no blackened dot at all are unplayed (or deadened).
For MOVEABLE forms [e.g., "F (move1)"], the flashing dots above the nut indicate the string(s) on which the chord voicing's root (or "1") occurs, so that you can more readily build different chords using the same moveable fingering pattern. Thus moving the "F (move1)" form one fret higher ("up" the fingerboard) creates an F# Major chord, etc.
Finally, the chart only includes the more common open positions and moveable forms of the Major, minor, dominant 7th, Major 7th, and minor seventh chords, for now.