first you need use photoshop now open editor and found the unit that need to work select unit viewer in the bottom left corner use "cuts" or some image capture screenshots in your computer I Was select "attack melee" and then press Pause when the unit is ready to perform the attack, this step is as you will. open Photoshop and Paste the image (ctrl+v) use Magic Wand Tool (W in the keyboard shorcut) in order to select white background, if is not select it all press again with this time hold