Edit View
To enter Edit View at any time tap 
in the top-right corner.
While editing tap the bottom corner arrows to move between pages.
When you're done tap 
to return to Run View.
Lower Toolbar
The lower toolbar is context-sensitive. The tools change depending on whether an object is selected:
Page Sorter - see all pages and change Book settings.
Page Settings - change the page layout and object settings.
Colour - change the page background.
Undo/Redo
When an object is selected:
Delete - the object.
Object Settings - modify the object's content.
Colour - change the object's background/border.
Done - deselect the current object.
Undo/Redo
Other tools appear in the centre of the lower toolbar depending on the selected object.
Content Objects
A page is made up of objects designed to hold a type of content (text, picture, sound, or video).
Link Objects
To view link objects tap 
to expand the left sidebar.
Link objects can be used to customise navigation.
To add an object to the page tap its icon on the left (if dimmed, it may be locked, or the page already has the maximum number).
To delete an object, select it and then tap .
The number of objects you can add, and how you can manipulate them, depends on the page layout.
Add New Page
While editing the last page tap 
in the bottom-right corner to add a new page.
Choose whether the new page is Blank or has the Same Design as the last one.
You can also add new pages in the page sorter.