Damn hacking utilities!

[Atari Master]

I've never really messed with MSDOS but I downloaded some programs that will allow me to hack some games. But damn it! I can't get the think to show the games code. Infact, I can't get it to do anything. Help me out. I'm trying to hack Pitfall. And I do have the grafix editor too wich I also can't get to work.