How do I use a compressor?

[norway]

I have a rnc compressor. I intend to use it on the whole mix from my PA. The question is, how do I use this unit? I have no experience in using compressors. How do I use the knobs, and what will they do with the sound?

[Plec81]

The first thing you should know norway is that even very experienced recording professionals have trouble understanding the difficulty of applying compression to a whole mix. But hey, you got to start somewhere right?

Read this through and it will help you immensely.
http://www.digido.com/compression.html