Twenty Seventeen Wordpress Theme Customization

Hi!

I've been working on my website, guided by this article: https://premium.wpmudev.org/blog/twenty-seventeen-wordpress-theme/?mksi=b&utm_expid=3606929-94.Ie3dH-CaRwe6MU3VrZsdvw.1&utm_referrer=https%3A%2F%2Fpremium.wpmudev.org%2Fblog%2Ffive-hacks-twenty-seventeen%2F%3Fmksi%3Db. I've done all the necessary steps and nothing has been happening with the one page navigation support. I've changed all the page ids and also added the primary navigation with custom links like /#about, /#contact, but I'm not quite sure if that should be the same case with the home link. Also, I installed the Simple Custom CSS and JS but cannot find the Add Custom JS.

It would be great if you could help me ASAP because I've been working on it hard and I'm a newbie!

Thank you!

Best,
Robert