How to use Ad Sharing in Wordpress Multisite Network?

I'm confused on how your plug-in and Google Adsense talk to each other. I've installed the plug-in and it is functioning properly in my Wordpress MU. I guess I was expecting an interface within Wordpress to see the sharing and accounting of advertising income. So this leads me to a few questions.

Does the sub blog administrator need to create a Google Adsense account? Or, is everything done within my Google Adsense account?

Do I place my Google Adsense code into the sub blogs, or does the sub blog administrator put in theirs?

Where can I see that Google Adsense revenue is being shared correctly? Inside my Google Adsense account?

Thanks,
Jeff