Dynamic menu for twenty seventeen

Hi, I am trying hard to customize my site using the 'twenty seventeen' theme. I read your blog post (https://premium.wpmudev.org/blog/five-hacks-twenty-seventeen/) and the page you achieved perfectly suits my needs. However, despite following every step of the tutorial, and even downloading the child theme, I can't make the menu link to the sections within the page.
I am very new to this. Please tell me what I am doing wrong!