In WordPress it is easy to add your AdSense code to your blog.
First login to the administration panel of your website. Then, go to the Appearance -> Widgets menu.
In this page select a “Text” widget and drag-and-drop onto your registered sidebar.
Then add a title for your advertisement and pastet the actual code that you have obtained from Google. Finally, click on the on the “Save” button.
You have completed your AdSense to your WordPress blog.