<head>code and replace it with
<head>code. Now again find
</head>code and replace it with
</body>code and replace it with
<!--</body>--></body>code. Save your template. You are done.
async='' . Here is example of asynchronous version
Also check my previous tutorial about making blogger label url or permalink like wordpress - Make Blogger Label URL or Permalink Like WordPress
And solve all the duplicate problems easily - Solve all the Duplicate Problem Easily