First, click on "no comment". Then you can type a message. Before you "publish" the comment, you have to "select profile". In that drop down menu choose "name/url" or "Google plus" if you have a Google account. (Even if you have a google account, you don't have to choose it. You can still choose "name") Under "name" type your name (first name is fine) and you can leave the "url" blank. Then click the blue "publish" button.
That will send me an email with your comment. Then I go into the blog and can choose to put it on the blog or not. Of course I will publish all comments from our friends and family. This feature protects me from people posting negative comments. After it is posted by me, everyone can see your comment.
I hope this helps you to understand how to leave a comment if you choose to. I hope you enjoy Hyrum's next post!