I just downloaded this program to run the games on this site. The games run but they have problems. I dont know what the controls are, it is to slow and it shows up on a double screen. Can you help?

Which program? DosBox, you mean?

Well, it's quite obvious that you ignored the readme file altogether. While with most software it is acceptable, emulators are not normal software - if you don't familiarize yourself with the readme, you'll have problems just like that.

Other than the readme, check the official FAQ? for about everything that can be said on running DosBox.

I found out how to slow the game down and the controls but the game still appears on a double screen so that I cant see everything. How do I fix that?

ALT-Enter to go fullscreen. You should do that before launching the game in DOSBox or you might end up with some weird problems. :)

Better to start DosBox in fullscreen mode altogether.