Lots of people don't understand how to use this so here's what I understood so far,
I believe the best games to use this in would be mutation and hero modes,
1- open the Color GetPoint
2- go in-game and aim at a mutant then press F5
3- open the Pixel Trigger
4- modify the R,G,B minimum (at your left) and maximum (at your right) values to be containing-in-range the values you got in the Color Log of the Color GetPoint, lets say I got "0,128,0", I would make the minimums "0,126,0" and the maximum "1,130,1" in order "R,G,B".
5- to make a beep if the color in range was in your crosshair choose "beep on detection" checkbox and to make it fire on detection choose the "fire on detection" checkbox.
6- I didn't really get what the length textbox is for, but It might be the range to fire at (how far your target is).
7- press Start, join a mutation mode or a hero mode and enjoy!
I hope this helped.