Meta name, content, in header

Hi,

I am doing a Facebook ad and beside the website address that FB automatically crawls, it also extracts your theme authorship info.

So below my Facebook ad it shows
http://www.businessstartupwisdom.com | By ishyoboy.com

which I want to get rid of By ishyoboy.com

I found the code in header.php
<?php ishyoboy_meta_head(); ?>
<meta name=”author” content=”IshYoBoy.com”>

Can you provide steps to remove this? I want to put it in child theme functions.php as taught by you. Thanks! I’m a content writer not developer :)