Link to section in a page

How can I make a link to a section further down the page? I can see where I should be able to do it, but the drop down list in the ‘section’ tab of the link options doesn’t list the page sections.

Here is my site Read-Only:
(how to share your site Read-Only link)

@iain71 give your sections IDs:


They should show up in the list after that.

Brilliant - thank you!