Is possible to add adsense in blogger post, meaning without editing the template html. Its like when I post an article I want to have the ads either on the right or left.
Yes, it is - you can't do it without altering the HTML of the post mind you. View your post in HTML mode and just paste the AdSense code where you want it to appear in the body of your post text.
Check out this thread to learn how to place adsense codes in your blogger blog http://forums.digitalpoint.com/showthread.php?t=282434 I believe they have elements now: so you can just add it in there.