Select the key icon from the main menu. You'll get a screen with 6 blanks to enter the password in.

Password	Effect
PESCHI	Level 02
MASTRO	Level 03
URIOLO	Level 04
NATALU	Level 05
CIUPET	Level 06
MORALA	Level 07
SUFEIS	Level 08
IMANID	Level 09
NIRIDN	Level 10
IDREPE	Level 11
QUAQUA	Level 12