I'm trying to make it on posts where the author's first and last name is displayed rather than the username, which is currently the case. After doing some searching, I found content-single.php in my theme, and the following code:
$utility_text = __( 'This entry was posted in %1$s by <a href="%6$s">%5$s</a>. Bookmark the <a href="%3$s" title="Permalink to %4$s" rel="bookmark">permalink</a>.', 'twentyeleven' );
Seems that '%5$s' is to represent the username. Is that so? Not the traditional PHP code I expect to see. So is this correct? And if so, how do I switch it?