It’s not you… Smartthings has always been very powerful, but not very intuitive. And a lot of things feel much harder than it seems like they should be, even when you are just using the built-in features. 
Usually if you are having a problem with a custom smartapp, the best thing is to ask in the author thread for that code. The author will be automatically notified when new questions are posted, and other people who are using the same code may also be able to help.
So in this case: