Add comment counter under post title

Hi!

I would like to add a comment counter under my post-titles for http://www.miison.se, but don´t know how.

I am currently using the built-in wordpress commenting system and the origin theme. The theme doesn’t show any comments at all (unless only viewing the specific post) so I don´t even know here in the code I should find it..

What kind of code can I use to add the comment counter and where in my code should I make those changes?