Here I am encouraging people to post comments to my blog, and it has just come to my attention that it is not clear where to post comments. So here's some quick instructions, and I'll include this at the bottom of each post. My blog design will change in a month or so to match my new website. I will try to fix the problem then. For now, here's what to do.
Go to the very bottom on the article that you would like to post a response to and look for the number of comments. This article will start with "0 comments". Click on that phrase. It will show all previous comments, and it will give you a form to post a comment.
Another option is to click on the title of the article. That will show only that article, along with all comments, and a form to post your own comment.
I have seen a number of other blog sites with similar design flaws. So for future reference, when you are on a blog without an obvious link, try poking around at the end of the article until you find a link.