How To Add 728x90 leaderboard Adsense ads between Header and Post Section in blogger

1.Log in to your dashboard--> layout- -> Edit HTML

2.Click on "Expand Widget Templates"

3.Scroll down to where you see this:
<b:section class='crosscol' id='crosscol' showaddelement='no'/>

 

 4.Now replace above code with below code.
<b:section class='crosscol' id='crosscol' showaddelement='yes'/>  5.Now save your template.

6.Go to Layout > Page Elements

7.Now Click on new 'Add a Gadget' option that will now have appeared between Blog Posts and the Header.

 8.Select 'HTML/Javascript' and add your 728x90 leaderboard Adsesne code and click save.

Now you are done.