How do you use the stock market?

If you are new to trading and investing then the best thing to do is to join a free site and invest with 'play money' for a while just to familiarise yourself with how things work. Get financial advice from an expert, or hire someone to manage your porfolio if you want to get started with real money. Avoid risky markets unless you can afford to have the investment go badly.

Don't just dive in with your own money if you can't afford to invest with it - some people do get rich, but mostly you should be looking at long term investments.