Trouble with Jquery

I found a great tutorial for one page navigation

https://trevordavis.net/blog/jquery-one-page-navigation-plugin/

No matter how hard I try I can’t seem to get the javascript to load. I’m new to jquery so I’m wondering if someone can explain how to do it for someone new to the language. I’ve installed the scripts in my directory but can’t seem to get them to work on my blog.

I could use an explanation. I’ve checked out the wordpress codex but that didn’t help very much. Need something even simpler.