How do I add a page to my document in Pages

you can place your cursor anywhere in a document and add text/items.

If you want to add a blank page without text (or are done with a page and want to start on a new one), you can insert a page break on any page and it will push any information below that point to the next page.

As an alternative to just adding text. you can turn on Page Thumbnails and then insert a blank page and drag/drop it to the location you want in the thumbnail pane

Jason