Reply To: David, viewing your numbering video, but I don't have "A Main page"

D, In the page panel, you'll find a “master” page called “none” and a master page “A”. If you check all your pages in that panel, you'll see they all will be “A-masters”, unless you've create some others.

To make the page number appear on each page, add the page number on the right master page. How, select the type tool, make a text frame, click in it so you can start typing and add the number (type menu- insert special char – markers – current page number).

This frame, you can move wherever you want on the page, top or bottiom, left or right.