Edited functions.php

Hi,

Iv'e made a copy of the functions.php file from the parent theme of buddypress social, and saved it to my notepad. And made the necessary changes, then uploaded it to the child theme, then i get this error.
Fatal error: Cannot redeclare browser_body_class() (previously declared in /home/womyclas/public_html/masscircle.com/wp-content/themes/bp-social-child/functions.php:81) in /home/womyclas/public_html/masscircle.com/wp-content/themes/bp-social/functions.php on line 93

Any guidance or help would be appreciated..

Thanks, Wayne