Quick Answer: When you want a page break, switch to HTML/Code view and then type <!–nextpage–>.

Whole Story

As simple as this sounds, it took me 20 minutes to get this to work.  My problem was that I thought the usage was like other plugin quicktags, where you can just put it in anywhere.  But if you put in <!–nextpage–> while using the “Visual” or WYSIWYG editor, it will change your greater than and less than sign into the html entities.

The problem with having to switch to the HTML or code view is that I have to scroll down and find where my spot was in the article (if I am putting in page breaks after publishing).  It would be great if WordPress had a button on the writing toolbar, like the “More” tag, that would insert page breaks without having to switch to HTML or Code view, or worrying about whether you are in the right view or not.

This took me so much longer than it should have that this qualifies as a “computer problem that got in my way”.