Here are some tips for editing fixed layout books:
1. Tap "+" button at the bottom bar to get started.
2. Tap the element displayed on the page to edit element.
3. Drag the element to move to the desired position.
4. Drag the black box at the right hand bottom corner of the element to resize the element.
5. Tap tool button at the bottom bar (next to "+" button) and select "Page Background" to change page background.
6. Tap new page button at the top bar (next to "pages" button") to add new page.
7. Tap settings button at the top bar and select "Cover Image" to change cover image.
8. Tap settings button at the top bar and select "Book Background" to change page background of all the pages.