As system administrator, there are two different ways to edit the system administrator's user data:

Option 1: Select the menu item User data - User via the menu. 

Option 2: Via the tile Users

The system administrator's record is displayed. The Edit action button is also displayed. When the Edit action is selected, the following fields can be changed. 

A detailed description of the settings can be found under:

Editing Users

Finally, the password can be set again via the Set new password button.

The entry of the new password must be repeated and saved for the change to become active.