This displays the "about the author" box. In order for the author box to be displayed, you must meet these requirements:
- Tagged the post with the author's name (under the "author" box on the right).
- Filled out a biography for the author (in Posts > Author).
Instead of displaying the author bio for the author tagged in the current post, you can alternatively display the bio for any author, regardless of whether or not they're tagged to the post.
To do that, simply add the author's name like this:
[about-author name="Author Name Here"]
The author's name must be spelled exactly the same way it's entered in Posts > Authors.