I would like to know what my blogger sites bring in. All I can see is how to place a publisher ID. I would like to set it to a channel too so I know what each site brings in.
Add in your own Google code with the channel on there. You have to add another widget and place the code in there, then move that around wherever you want it.
in order to put an ad code with channel, you need to remove the entire ad code from the blog template and put your own code there. to learn how to, visit this page
You could use URL channels... but if you have a lot of content you will run out. If you have a lot of blogs, and don't track anything, create a channel per blog... and if you have a blog that is making money, create more channels so you can track down what is working. Alternately, use Google Analytics and set up an Adsense click goal... do some searching and you'll find information on that too.