NEC NAR01 Instruction Manual page 18

(3) The "Administrator password changing" screen appears.
Change the administrator's password as you like, and write it
down in the "Administrator's password" box below and
click "変更". If you do not want to change the administrator
password, click "スキップ".
Do not forget to write down your administrator's password. The
password is essential to the configuration of this product. You
need to enter the password to open the configuration screen. If
you forget the password, you will need to initialize this product.
Note that all the configurations you have saved will be deleted
during initialization.
Administrator's
password