There is no need to enter the default PIN as you can bypass the PIN entry with an OK.
You can look up the current PIN in BridgeScorer Controlís/File/Display PIN codes, where you can also change the TD PIN.
Note that the default PIN always works on the Start screen. This is good to know if you one day would face the problem to look up the results in a BridgeTab with unknown PIN.
PLAYERíS PIN CODES
PINs can be listed and changed here, which is very useful when it is required that the players confirm their results with PIN. (Option not available in all versions.)