Acer Iconia Tab 10 - Changing the Home Screen Wallpaper; The Onscreen Keyboard

Using your tablet - 17
Changing the Home screen wallpaper
Tap and hold any open space on the Home screen. Here you can
choose from a variety of options to set as the background to your
device.
The onscreen keyboard
When you tap a text box to enter text, an onscreen keyboard will
appear. Simply tap on keys to enter text.
Note
The layout of the keyboard (and some button icons) vary slightly, depending
on the application and information that is required.