How to put an AdSense banner on the homepage of Boulevard Theme?

Hi, I use the Boulevard theme and i would like to place a banner on the homepage after the first two boxes of the post, how can I do this?

Thanks for the help.

If there is a widget you can add to your theme it would be easier. But you can always add the Adsense script without your home page source code.

You need to edit the wordpress loop to do so.

Please, how can i edit the wordpress loop?