“I couldn’t really find the code to customize in the functions.php… Should I just add the code they show under your links in the functions.php?”
The code isn’t in the functions file it’s inside the Genesis Framework. In order to change how it appears in the Framework, you would need to add the code inside the functions file (in the Child Theme). When you add the code from the link above inside the functions file, it overrides the default code from the framework (so you don’t have to edit the Framework Files).
Using a plugin like Simple Edits will also get the job done as well. Just make sure there are no PHP errors when you add it in.