Changing About username to By username to fix Google authorship bugs

In the bottom of each blog post there is the author section and it says About “author name”, and not By “author name”.
http://gtacontentcreators.com/dm-tdm-design-gta-online-part-1-gm-hoot/

This become a problem when we try to get Google authorship approved
Automatically detected author name on webpage: Not Found.

https://plus.google.com/authorship
Make sure a byline containing your name appears on each page of your content (for example, “By Steven Levy”).

Since our pages don’t contain the word “By” but the word “About” the tools cant recognize our linked name.

In single.php I found and edited it and add By

 <div class=”author-block wcontainer”>
                <?php echo get_avatar( get_the_author_meta(‘ID’), 250 ); ?>
                <div class=”author-content”>
                   <h3>By <?php echo get_the_author(); ?></h3>
                   <?php the_author_meta(‘description’); ?>
                </div>
                <div class=”clear”></div>
    </div><!– /author-block –>

But when I save it my website still show up the word “about” ….. Any tips on this ?