If you are using Emporio blogger theme for your Blogger blog, you can place Adsense ad below your blog post as seen in the screenshot below :
Here is how :
Go to google.com/adsense to generate your ad code. Parse the code at freehtmlparser.blogspot.com
Sign in to your blogger dashboard at blogger.com.
Navigate to “Theme” > “Edit HTML”.
Click inside the HTML.
Press CTRL F on your keyboard and find <data:post.body/>
Copy the parsed Adsense code and paste directly below the <data:post.body/>
Save.