I can't see any google ads, but can see where the arrows are.
It's just a template hack - find the spot in the template and insert adsense code - it
can sometimes be that easy, although sometimes you
can find yourself looking at a blank screen (so make sure you have a backup) trial and error most of the time. I've tended to insert them out the way at the bottom so they're not too intrusive, or just underneath the banner / logo (in the header).
On one of the sites we've since moved over to a CMS which has nice blocks left and right, a nice handy place to put them and to always have on screen no matter where members are navigating.