On the hobgoblin diagram, the chords the + and - signs to the left (on the diagram) of the bass notes they go with. + is major chord, - is minor chord.

So along the top of diagram,
(+) (D) (+) (G) = Push: D maj D bass G maj G bass
(+) (A) (+) (D) = Pull: A Maj A bass D maj G bass

To play in D, all you really need to know is to use the D/A pair - that's the top left two buttons in hobgoblin's picture. When you find a chord that doesn't fit the notes you are playing, try the E/B pair - in particular the E and E minor on Pull and use that if it sounds "right" - or at least better.

To get more sophisticated chords while playing in D, you need to go across to the G row on the RH. Don't bother with that to begin with - you'll only get confused.

Basic vamp pattern: Bass button on the beat, chord button off the beat.

Anahata