Adsense for Blogger: The commonplace to insert Adsense code is on the header, on the sidebar, under post’s title, in the middle of posts and after post.
Before editing your theme, you have to make a backup of current working theme in case anything bad happen after changes, you can restore it quickly.
Backup your current working theme first by click Theme on the left section, then click the Backup/Restore button, click Download theme button.
On this theme, I found Ads2 after the post. Then I replace with Adsense code and delete Ads1, and Ads3.
To insert Adsense code into blogger theme you have to convert it first otherwise it will not work, I am using this tool to convert the Adsense code to make it work.
I still cannot found the correct place to insert Adsense code under post title on my theme. After looking for some times, I try to test the location by putting Ads1, Ads2, Ads3 again and finally I found after code <b:else/>
Now I have 2 working ads after post title and after post content.
OK that’s it for now, I hope now you can implement the Adsense code on your own blogger theme, cheers.