If you wish to use your academic degree (or not), you can select your preferred name spelling in the user account management portal of the Regional Computing Center (RRZ): https://account.uni-hamburg.de
If you have changed your academic title, your name should change the next time you log in.
If your academic degree is not stored or cannot be selected, contact the ServiceLine of the Regional Computing Center (RRZ): https://www.rrz.uni-hamburg.de/en/beratung-und-kontakt/serviceline.html