Comments Plus not showing on Theme

Hi There,
I am trying to use Comments Plus on a site that is using the Titan theme by Theme Foundry. There is a child theme in use but the comments.php is on the main theme.

I've read up and guess the required hooks are missing but I am a little lost beyond this point and was hoping someone could help.

Here is the comments.php - if you need anything else then please ask but I would be grateful if someone could point me in the right direction.

Thanks