How do you use Dark Walk's Private Server Trainer for a MapleStory Private server?

There was something on a private server website that said unlimited fly and flash jump were allowed, and if we wanted it, we would have to download something. Well it turned out this something was Dark Walk’s Private Server Trainer, but it never explained how to use it. It looks cool so I want to try it. Don’t worry, I’m not going to use it in Global MapleStory!