Yes you can - but I've never tried myself.
Take a look at the code behind a page with ads to see how it's done (Use the "Edit this page" link to find the code). Then use the same technique. Most people would pay to remove the standard Nabble ads first.
Search for Adsense on this forum. You'll probably find more detailed instructions.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.