Pardot Integration – where to add code?

I have my WP site installed and running, and have loaded the Pardot plug-in. I am receiving form submissions.

However, I learned from Pardot that I also need to add their Javascript on every page for full visitor tracking. The Pardot instructions state to add the code “before the close body tag on your HTML pages”. Where exactly do I find the code to edit? When looking at the WP pages, I can see html within each of the text boxes in classic mode, but that doesn’t seem to be it.

One suggestion I have seen is to add the code in the “footer bottom” widget, which should address the whole site. Does this sound right? Any other suggestions on the appropriate place to add the code?