No worries Josh, its easy to do. At the top of this reply there is a tab, reply. It takes you to the full reply page that is a little different than the quick reply at the bottom. Once you clcik it you'll see the reply box and the words additional options listed just to the left below the box. Click on it and browse to you C:\Mach 3 folder. There you will find your screen set. I don't know if you have a custom or not but by your problems I think maybe you do. It will have the .set extension on it. If it is the default 1024.set you'll have to rename it before posting it.
Hope this helps,
Brett