So far, the only way I was able to add a comment was the following procedure:
- Go to the desired blog address such as Coni's "gid299.blogspot.com" or this blog "testblog2015v1.blogspot.com/."
- Click on "Create Blog" in the upper right corner of the screen.
- Cancel that action.
- Click on the orange horizontal rectangle with the pen icon to create a new post on the desired blog.
- Compose your comment on the screen provided.
- Don't forget to add a title to your post at the very top of the page.
- Click "Preview" in upper right corner which opens another window.
- If it appears as desired, close that new window and publish your post.
If any of you find a more streamlined way to make a comment, I'd love to learn your streamlined methods!