No, there is not a tutorial for this.
you would need to create a new table for comments:
commentID - Priamry key
commentBlogID - ID of the blog being commented on
in the tutorial i linked to, the blog detail page uses a URL Variable to load the blog article:
<a href="blog-details.php?ID=<?php echo $row_BlogRS['ContentPageSetOrder']; ?>">
the ID Url variable can be used to populate hidden form element in the comments form.
then use an insert record behavior to insert the comments.