When I set this blog up, I didn't look closely at how the comments were to be handled. When I started to hear back about difficulties in commenting, I found I could post my own comment without a problem.
The thing is, I'm a registered Blogger user, so I got right past all the barriers that were there to keep out the hoi polloi without noticing them. Happily, at last my wife Lydia investigated the matter and smartened me up.
I have removed all barriers now, so posting a comment here will no longer be like buying Sudafed. In the "comment as" dropdown box, simply choose "Anonymous". I'd get rid of that box altogether, but that doesn't seem to be an option.