for iOS 9.1 software

Unpair a wireless keyboard. Go to Settings > Bluetooth, tap next to
the keyboard name, then tap Forget this Device.
See .
Add or change keyboards
You can turn typing features, such as spell checking, on or off; add
keyboards for writing in different languages; and change the layout of
your onscreen keyboard or Apple Wireless Keyboard.
Set typing features. Go to Settings > General > Keyboard.
Add a keyboard for another language. Go to Settings > General >
Keyboard > Keyboards > Add New Keyboard.
Switch keyboards. If you haven’t added any keyboards, tap to switch
to the Emoji keyboard. If you have multiple keyboards, tap to switch
to the last one you used. Continue tapping to access other enabled
keyboards, or touch and hold , then slide to choose a different
keyboard.
For information about international keyboards, see
.
Change the keyboard layout. Go to Settings > General > Keyboard >
Keyboards, select a keyboard, then choose a layout.
Bluetooth devices
Use international
keyboards