compiling is putting t together so it is playable
http://www.microsoft.com/express/Downloads/#2010-Visual-CPP editing software
http://www.powdertoy.co.uk/Download/powder-42.3-src.zip source code

Compiling is when all the codes that you've edited get mooshed into a program an exe in your case. If you find compiling hard don't worry too much cause until you've figured out how to do it, nice people like yew101, holy and other people who can compile will do it 4 u if your nice to them lol

But still try to compile

visual c++ 2010 express

it takes a while then have to restart to finish at end