Because of their authority on the subject (they wrote the post in the first place, after all), it is often reasonable to assume that an author's opinions in the comments of a post are more important or pertinent than others'. As such, it is beneficial to readers of a blog for a theme for the author's comments to be highlighted in a noticeable way.
While there are many ways to make an author's comment stand out, the most common way is to have the background color be different for the author's comments.
First, you need to make sure that comments are being displayed for your posts. As such, follow the recipe Displaying comments on a post and add a comment loop to your theme for your single.php
or page.php
template files. This makes sure that the appropriate HTML code is output so that your browser can render the comments on your site.
Next, you need to style your theme's comments in a way that makes it apparent when an author is commenting...