Leave a link on other blog to get traffic to your site

many blogger leave comment on other website to get traffic to their blg but they do not know how to leave a clickable comment

 I have given a link for How to show article in any search engine

<a href="http://kudaripost.blogspot.in/2014/08/how-to-show-article-in-google-within.html">Index Article in Google Search Engine in Minute