How to Add Link to your comment

What is the main purpose of posting your website to the other blog?

 It may use for backlink profile and it may increase your blog PR.

If you want to post a comment in a different blog you only need to do is to paste this html code:

<b><a href="Your Blog Address">Title of your blog</a></b>

Here's the example:

<b><a href="http://www.bloggingtuts.net">Webmasters and Blogging Resources</a></b>