I wish I knew a lot more about web design and script. I would make a couple of formatting changes to my blog, including a *much* more obvious spot to leave comments.
Until then, to leave comments about any of the posts, just click the spot below the text that says "comments" next to the date and time. There is a little pencil icon there as well that you can click on. Another page will pull up for you to leave a message. You can post under a username, or as other or anonymous.