This post will be updated shortly with screenshots to better explain the process
Sign on as a Manager operator and press the Functions (or Manager Screen) button followed by the Back Office button.
Once you are in Back Office mode, press Utilities followed by System Menu, then Screens.
Press Screen Designer to take you to the Screen Editor Module
Select which Till Screen you wish to edit and press the green Select button
From here you can choose any button from your till layout and press the Edit button to adjust what that button does or how it looks on the screen.
When you're finished simply press the green Save button and choose No when asked if you wish to continue editing.
To return to sales mode, press Sales/Review, followed by Sales Mode