Source
Actual
Step 1:
Select the Paint Range in your Instructions.
Step 3:
Select the color in the callout.
Step 4:
Click "Add" to use the selected color.
Step 2:
Select paint range(s) by clicking "Add" (max 4).
This utility makes use of several 3rd party libraries and has some restrictions on its use.
JQuery
JQuery UI
ColorMix