How to add nofollow tag

How to add nofollow to a specific link:

<a href="example.html" rel="nofollow">Example</a>

<a href="example.html" rel="external nofollow">Example</a>

Tried to set nofollow each link in post? Just Adding nofollow on links on every post.

Add nofollow to all of the links in the page by adding following meta data to the head section:

<meta name="ROBOTS" content="INDEX,NOFOLLOW">

For blogspot blog just add "/" at the end of the code and place below <head> section

<head>

<meta name="ROBOTS" content="INDEX,NOFOLLOW"/>