Adding Ads

I want to add and ad on top of the title “Fair Copyright for Canada” on this page ( https://jasoncarson.ca/?p=10 ). Basically any page when you click the title of a story on the front page.

What file do I have to modify to do this. I am using a modified version of the default Kubrick theme, so if you know how to do it for Kubrick please let me know.