Several of you were quite frustrated because you wanted to comment when I first sent you the link to my blog, and couldn't. I'm sorry it's taken me this long to look into it.
I went into the Google blog place intending to go look and see what was required and tell you. Turns out nothing is required - I had just not looked at the standard settings, and I needed to change something in the settings. Now anybody in the world can comment on my blog.
Love to you all!