How to Put Links in Blogger Comments
Go the comment box and type in your comment, now just after the comment (in the same box), type in the code bellow just change the url and the text to your own.
<a href="http://techhapa.com">this is you text</a>
The red part is the url pointing to your blog or page and the blue text can be any keyword or key phrase depending on what you think the comment readers might want to click.