Above the map, click the "EDIT MAP" button.
Click on a color box located in the FORMAT section and a color picker will display.
There are three ways that you can change the colors on your map; enter a HEX code, enter R, G and B codes, or click on a color in the color pallet. The map and legend will update automatically. Click outside of the color picker to close it.
To change the tint or shade of a color, click on the color box, then click on the preferred shade. The map and legend will update automatically.