Many Wordpress site owners have been looking for ways to add Adsense to there Site.
Just read below
With WordPress you can easily add your AdSense code to your blog. In order to do this, first login to the administrative end of your website. Then, go to the Appearance -> Widgets menu.
In this page select to drag-and-drop a "Text" widget onto your registered sidebar.
Then you should add a title (in our case - Advertisement) and right under it the actual code that you have obtained from Google. Finally, click on the on the "Save" button right under it.
Well done! You have just added your AdSense code to your WordPress blog.