Pick the store this TV is in. It's remembered on this device, so you only do it once.
Turn an item off when that store runs out. It changes on that store's screen within about a minute. Turning it back on puts it straight back.
Prices and names here apply to all three screens. Use the arrows to change the order items appear on the board.
Entered once per device and remembered. Without it this device can look but not change anything.
The PIN just stops a customer or stray tap opening this panel on a TV. The staff key above is what actually controls who can change the menu.
Landscape works best. It's resized automatically. Leave empty to keep the current photo.