After having problems with the Blogger comment interface, I have decided to try HaloScan for comments.
It was pretty easy to set-up in the template, and it has received good reviews on-line.
Hopefully, it will work better than Blogger's comments have been.
To add a comment, click the 'Add a Comment' link following each post. A pop-up window should come up with any existing comments, plus an interface for adding your comment.
Let me know what you think. THANKS!