PhillShaw on "Enable comments on Custom Post Types"

Hi guys,
I have read around the forums but cannot make comments visible on custom post types.
I have added this code to my CPT.php:

'supports' => array('title','editor','thumbnail', 'author', 'comments')
	  );

But from what I have read I need to add something to my themes functions.php too but can't isolate what code to add to where from examples I have seen. My functions.php code is:
http://pastebin.com/M0ptZFGV

Any help would be great, Thanks!