Category Blog shows "Add Comment" when not registered

[sallyann2746]

I have JComments 2.1.0.0 installed on Joomla 1.5.11.  I am using Category Blogs to show all articles in a specific Section & Category.  However, if the user is not registered, I see "Add Comments" on the Category Blog page if they are not registered and only want "Add Comments" to show if they are registered.  The system works just fine between the public and registered if I am going to a specific article, but in blog format, it doesn't.   I looked at the code to see where I could put in a check for $user =& JFactory::getUser(); and then check  if($user->get('guest')) : ?>, but I wasn't sure where to put this work around/fix.