Okay, so the Google Adsense code cannot be added for the whole forum? Would that go in the header include?
The items listed by Gizmo generally cover your whole forum:
- Header Include (inserts code above the navigation bar)
- Footer Include (inserts code below the footer)
- Sidebars
- Custom Island Insert
You can also use a unique Header/Footer for each forum. This is setup in the "Custom Inserts" tab per forum.
While there, the Custom Island Inserts can be used. These will show up between the 1st and 2nd post of a topic. Usually the most effective place to put ads.
As for Google Adsense, you can insert just a single piece of code from google in to your Header Inserts, which will allow Google to place their ads around your pages wherever they feel is best. I am currently using this, and it seems to work out really well for me on the sites where I use it.
Additional reading on Google Auto Ads here
https://support.google.com/adsense/answer/9261805?hl=en#auto_ads
