Lightbox issue

Hello,
I want to assign a lightbox to a certain button when it’s pressed.
I have the current theme @ brkdesign.eu
On every box on the lower right side there is that little Play button which tells you to click it if you want more info. When you click it it takes you to the single post page. What I would like, is to redirect via a lightbox when it’s pressed and not onto single post.

Thanks