OK here it all is w/ pictures!!
You *need* re-inkers to be able to do this. Just squeezing the pad together won't get you enough ink.
You just dab the blender pen into a drop of the re-inker - don't hold it in there b/c it absorbs immediately and a little goes a long way!
Once you have some ink in your blender pen put it in the Color Spritzer like you would the Stampin' Write® Markers.
Spritz away!!
Once you've done what you want just take the blender pen out, scribble off any extra ink onto scratch paper and it's good to go for the next color!