Before you touch the "Programming" button, practice using DDT4All to read fault codes and view live data. Once you are comfortable navigating the BSI tree, then and only then should you insert that blank key.
The short answer:
is a complex and high-risk procedure that requires specific technical knowledge and databases. Key Programming Capabilities Immobilizer Interaction ddt4all key programming
Do not use the "Delete all keys" function unless you have a Master Key (red key on old PSA cars) or a known-good working key. If you delete all keys and have no valid transponder, your car becomes a brick until a locksmith reads the BSI via EEPROM. Before you touch the "Programming" button, practice using