it looks like you have the CMS Files in a folder named "admin" on your site.
The routine for creating the developer notes path will strip the name admin.
try changing the developer notes from:
<?php
include('/homepages/39/d327955887/htdocs/OLGTeens-Site//WA_CMS/addtosite.php');
echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'About Us', 'Content', false);
?>
to:
<?php
include('/homepages/39/d327955887/htdocs/OLGTeens-Site/admin/WA_CMS/addtosite.php');
echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'About Us', 'Content', false);
?>