when the panel veritas panels boot up it starts the setting process.
any zone that is active will show on the keypad.
so system needs to be disarmed.
You would enter the User code (default 4321) and the the unset light should be on.
It is possible that the system has been defaulted so if your user code hasnt worked then try the default code.
It is possible that the keypad ribbon isn't properly inserted into the connector block.