do u have to set channels? and what do they do? need to know....lol.

You don't have to set channels, But it will help you see what sites or pages are performing better.

I have a channel for my directory, My forum, My blogs and for the WT adsense sharing program. Then i can go into adsense and see how many impressions and clicks each channel has got and i can see earnings for each channel.

If i didn't have the channels i would have no way of knowing which adverts were performing and which are a waste of space.

you can set up 2 kinds of channels.

url channel, which associate with a particular page/url of your site.

custom channel, which you can set it to associate witha particular ad block (on 1 page or multiple pages). Thus, if you need more detailed stats, you can use custom channels.