We just added comment counts for for blog pages, so it’s easy to see than you can comment and how many comments there are, as well as provide an obvious link to get to the comments.
To use blogs, you’ll need to enable the Tumblr add-on (http://help.22slides.com/article/blog), and to get comments, you’ll need to enable the Disqus add-on (http://help.22slides.com/article/blog-comments).