From September 13, 2023, it will only be possible to modify the postal data on certificates made before the indicated date.
To modify the postal address of your idCAT certificate, access www.idcat.cat from the browser where you have installed the certificate and then in the "Certificate management" section select "Modify the certificate".
If you want to modify other personal data such as name, surname, e-mail... you will have to revoke and request a new one from a Registration Entity idCAT .