Hello Jeff Reeves,
Thank you for using Apple Support Communities.
From your post, I understand that you are not able to add a new page in the place that you want to add it. I know how important it is for your book to be in the order you want it to be in. Once you add the extra page are you able to drag it where you want to put it?
I recommend reviewing the section in the following article for adding a new page.
iBooks Author: Add, reorder, or delete chapters, sections, and pages
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In the Book pane (shown above), select the chapter or section you want to add pages to.
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Click Add Pages in the toolbar, and choose Pages > Option.
Tip: You can also add a new page by Control-clicking a page in the Book pane and choosing Insert Page from the shortcut menu. The new page uses the default layout for the chapter or section.
In the Book pane, do either or both of the following:
Change the order of chapters: Drag them.
Change the order of sections: Drag a section to a new location in the chapter, or to another chapter.
When the new page is added to the end of the chapter, see if you are able to drag it to the position you want it to be in.
Cheers