You can always see the distance to front, middle and back of the green on Pebble. Use upper and lower right buttons to change current hole.
To track a shot press the middle right button on Pebble. You will see it display '+Shot'. If you want to mark a shot, you are done (you can optionally tap middle right button again to move to default view quicker). To enter putt or penalty, use upper and lower right buttons.