No one can tell you what settings to use. What you go with will depend on the track you have, the context in which it is being used (how it sits in the song) and most of all your own personal taste. A quick google search will help you understand what compression is. I'm no expert, but you can start off by a ratio of anywhere between 3-5. Keep pulling the threshold down until you start noticing some gain reduction (the number in red). You probably don't want more than 6,7 dB on gain reduction at the highest parts. If the track starts pumping you pulled it down too much.
