Using a variable to show a layer in a lightbox

Hi Everyone,

I have searched the forums but haven't quite found an answer.

I am making a journal that the learner uses to respond to some questions throughout the course.  I set the journal up as a slide with multiple layers that will become a lightbox when a button is clicked on a different slide.  I want the user to click a button and the lightbox open with the appropriate layer showing.

 

I have tried multiple adjustments to the variables and I haven't come up with anything.  I have shared where I am currently, and wont mention all the different things I've tried- because I think I missed one small step.  

 

My question is- How can I do this?  Is "true/false" the right type of variable to use?  

HELP!