If you are working on a certified project, it is protected from unwanted changes to ensure safety. Uncertified configurations can generally be edited or expanded freely within the software.
Your path forward depends on your situation: pnozmulti configurator default password
It seems you're asking for the default password for the software (used with Pilz safety relays). If you are working on a certified project,
If you cannot access the device because of an unknown password, you can reset the hardware to factory state. pnozmulti configurator default password