If you have the PHP knowledge, do a simple if else. Here’s one I whipped up quite some time ago for just this purpose:
<?php
$isByAuthor = false;
if($comment->comment_author_email == '[email protected]') { /* INSERT EMAIL IN USE BY OWNER OF SITE */
$isByAuthor = true;
}
?>
and then, I have the following:
-<?php comment_author_link() ?> @ <?php comment_time() ?>, <?php comment_date('m/d/y') ?><?php if($isByAuthor) { ?> <span class="authorcmt">Blog Author</span> <?php } else { ?> <?php } ?>
Everything is normal up until the if $isByAuthor. If that variable is set, it’ll display the text “Blog Author” that is then styled by the CSS class “authorcmt.” This all goes in the comments template, modify as needed.