The Brougham Gamer

I've followed the forum showing that the best airbrush plugin was from unsedhonda. I installed the brush mini and saw that the files need to be a dll to be put in the system. the file downloaded as a png. I tried using the creation tool to make the brush but I cant understand to go anywhere from there. sorry if this is simple as I'm not bright at all with computer stuff. much thanks, The Brougham Gamer