You can change which keys are displayed in the Touch Keys bar, as well as how they’re displayed.
From the Home screen, touch and hold the Recent
Apps Button (in the Touch Keys bar) > Settings > Display > Home touch buttons.
Select the modification you want to change.
Tap Button combination to select which Touch Keys you want in the bar and their location within the bar. Choose from the Back Button, the Home Button, the Recent Apps Button, the Notifications Key, the QuickMemo+ Key, the QSlide Key, and the Dual window Key.
Tap Color to set the key color. Choose from White and Black.