To change the pages background, you have to access General Settings -> Page Background.
Here you have the following options:
- Page background color – use this to change the page background color
- Background Image – use this to change the page background image
- Pre-set – use this to control how the background image is displayed. There are the following options: default, fill screen, fit to screen, repeat or custom.
- Image Position – use this to control the positioning of the respective image.
- Repeat background image – check this checkbox to repeat the image in the background.
- Inner Page Background Image – use this to set a different background image for inner pages.