CMS Adding an If Condition - Comments Box Visibility
 

Currently only registered members may comment on Content.

I would like to have a notice display (in place of) the comment box for unregistered members/guests, so that they see a note at the bottom of each article (in place of the comment box) that states,

"Register Now to add your comments here".

Which template do I edit to add this and what exactly do I write for a conditional to make it work?

TIA!