Navigate to any heading in the PUBLISHED version. When you hover over it, some grey icons appear to the right. Click the third one.

A popup appears which contains the code from @8.1. Adding the tomehost CSS and Javascript libraries‍ above, and below that, the text for the link. Copy and paste this link text to your page.

You should see the link appear as a small circle with a question mark within it. Clicking this should launch the embedded help popup, and open it to the section where you generated the link.