BuddyPress.org

Hey I am trying to do alot with BuddyPress, like removing the admin bar etc, and all the tutorials I see have to do with editing the bp-custom.php file. I couldnt find one in wp/content/plugins, so I made one with notepad and added the line :
define(‘BP_DISABLE_ADMIN_BAR’, true);

and when I loaded my site it went to a white screen that said the line then redirected it to the blog.

How can I get this working correctly?

Thanks