Hi tone elin,
Congrats on taking your first steps towards creating your own content using iBooks Author. The resource below will explain how to add and rearrange sections in your book:
iBooks Author: Add, reorder, or delete chapters, sections, and pages
Your book is made up of chapters. A chapter can contain pages and sections.
A section is a part of a chapter. You can use sections to divide the content of a chapter into topics ....
As you add content, new pages are added as needed, or you can add pages first. (When you view a landscape template in portrait orientation, each chapter or section has one scrolling page that displays all the content.)
Important: You can’t drag individual pages to reorder them
-
In the Book pane (shown above), select the chapter that precedes the chapter you want to add, or select the chapter you want to add the section to.
-
Click Add Pages in the toolbar, and choose either Chapter > Option or Section > Option.
-
Click a chapter or section title and do any of the following:
-
Add a chapter or section title: Click the “Untitled” placeholder text and type new text.
-
Change the prefix and number displayed: On the book page, double-click the word “Chapter” or “Section” and choose an option from the Section Number pop-up menu.
-
Replace a section title with a chapter or book title, or a chapter title with a book title: On the book page, triple-click the chapter or section title and choose an option from the Title pop-up menu.
You can also add a chapter or section by duplicating one. Select a chapter or section and choose Edit > Duplicate.
In the Book pane (shown above), 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.
Here are some additional iBooks Author resources to get you started:
iBooks Author Help Manual
Mac Apps Support - iBooks Author
Enjoy!