How do I activate a camera for my mac?

How do I activate the built in mic with my isight camera using a mac computer with Yahoo messenger?

• The mic works when I'm just using the isight camera by itself. But when I broadcast, the audio doesn't come on and there doesn't appear to be a feature on yahoo messenger that I can activate.

• Answer:

  I'm not sure why you're trying. Yahoo refuses to give the mac version voice features. This seems most likely a case of bad business by an almost monopoly. If a certain company, let say "micro-hard" just so we dont take chances messing with potential danger, realizes that its largest competitor (apple) has better hardware and software than the computers that carry it software, one easy way to stay in business would be to pay many companies to make all software for the competing company inferior, as to make the customer believe that the computers by the competing company are inferior. I almost forgot to mention, if you think the mac version is bad, take a look at the unix version. poor thing is a crying shame. I guess Gates really does rule the world.