Flint includes a hook within the author box that allows you to append more author information after the bio. The hook name is flint_after_authbox_bio and here’s an example of how to use it.
add_action( 'flint_after_authbox_bio', 'my_number_of_posts' );
function my_number_of_posts() {
$numposts = get_the_author_posts();
echo "<p>I have written " . $numposts . " posts.</p>";
}
And here’s how it would look :)
