I searched plugins and none said they work with latest WP, and/or were currently being supported.
If I use a widget I would have to put them into the body or a sidebar. Nothing as clean as what was in the video above.
I tried a shortcode solution I found – it did load a link to the child that belonged to that parent page, way below the page title, and no the far left, no padding, etc. So I’d have to figure out how to css-it, I’m not sure how.
But did not function as the one’s in the video above.
The account you’re using to post here doesn’t own any sites on WordPress.com, and the tutorial you link to applies to the open source WordPress software, not to WordPress.com. If you have a self-hosted WordPress site, the best place to ask for help is the WordPress.org forums instead: