Change the personal data in the admin profile

If you are logged in as (super) admin you can see in “Preferences” under “Personal Information” in the middle of the page has “website, twitter, telephone, adress…”
How can you change the entry?

I can’t edit the field, and I haven’t found anything in config.php… nor in many other directories…

Does anyone know the trick or the hack?

Thank you.

Are you using ldap for user management?

no, i dont use ldap … its only me on this server and i am the admin (super user)…
i dont know what to do