The box at the top of the dialog box displays the color you selected. This color will change accordingly as the color settings are changed.
Hue, Sat, Val, Red, Green, Blue
These boxes show the numbers for the selected colors. You can change the values for Hue, Sat, and Val. You can also vary the amount of red, green, and blue in your customized color.
Click on the arrows to change a value one increment at a time or type the desired value. When you have the color you want, you can save it. Saving the new color automatically adds it to the palette in place of the original color.
Note: You might want to record the color settings for the original colors before making changes because once your customized colors are saved, you cannot automatically return to the original colors.