Where do I place the Java script?

I am using Storyline 3, I need to print the results of a course quiz. The print button that is provided prints far too much information because it gives out the quiz questions and answers. I only want to print the results screen. So I have 2 questions. First, can the existing button function be altered to not print the questions and answers? (How?) Second, if I have someone create the java script, Where do I put it? I could not find where to physically type the programming. I would appreciate any assistance or advice.

UPDATE: So I have found more information on the existing print button, but I would still like input or to be pointed in the right direction for the issue of where to put the java.