I emailed Ludei a few months ago asking this same question after doing a little poking around on their wiki and found this page http://wiki.ludei.com/cocoonjs:adnetworks
, their reply was that everything on their extensions will be presented in their documentation.
I'm guessing once you sign up with a compatible ad network you'll be able to put your account information in their template once it's time to compile your project.
And I also remember seeing something somewhere about needing to sign up for their 'premium' option to be able to implement ads and IAP with basic compiling being free. I'm going to need to double check that though.
Hopefully things will be up to snuff within the next month or so because I'm VERY interesting in their dev environment.