How To Add AdSense Ads To Blogger Header

1. Go To Blogger.com >> Click On Template >> Edit HTML and Proceed it
2. Now CTRL+F to Search for the below Code/Script

<div class='region-inner header-inner'>

If you haven't found the above try finding the below Script

<div id='header-wrapper'>

3. When You find any one of above code, 

you should find the following code just below of above code

<b:section class='header' id='header' maxwidgets='1' showaddelement='no'>

4. Change maxwidgets='1' to maxwidgets='3'

and;

change showaddelement='no'> to showaddelement='yes'>

Thats it, Now Save your template.

Now,

Go To Blogger Dashboard

Click On Layout

And Now You will see an option of adding new widget in the header

Now Just add AdSense ad code from the Box,and wait for few minutes your ad will be live.

Happy earning!