If you are posting pre-sales questions, all we can do at this point is confirm that, yes, Adsense can be added without the need for an add-on.
If you require additional support, please log into the Customer Area and add your forum username to the "Forum users" page to associate with your license, or submit a ticket.
Not only can you add Adsense, but there are specific Templates set aside just for you to paste the code for the top of the page, after the first post, etc.