(1) Click to pick a color from given Color Swatches above.
(2) Click inside the areas in the drawing. The Picked color automatically gets filled.
(3) Repeat Step one to pick New Color.
(4) To change the color, just click on previously filled color with new color.
Click over the thumbnail to see Enlarged colored samples on separate window for reference. Enlarge all four samples and restore them down to view one by one. Fill your colors diifferently from samples.