Q: How do I edit footnotes in Pages?

Welcome to the Apple Community.

Arrange > Section Masters > Make Master Objects Selectable.

It does for me.

This worked, thank you.  Unfortunately, it worked after finding this page, which took about half an hour of searching, and being re-introduced, over and over, to the idea of creating footnotes. 

Editing footnotes is mandatory.  It's so easy to do in Word--you don't even have to think about it, you just click and make your changes.  I had expected Pages to be equally simple, if not more so, and I was pretty annoyed to discover that it took an arcane trick to perform a very simple, very necessary task. 

What sort of illiterate clown decided that end users shouldn't be able to click on their own footnotes to edit them?  I hope this function will be upgraded, and that Apple will stop trying to complexity their products by burying turn-ons to the most basic academic functions in a word-processing program inside layers of menus.