Acer AT350 F1 - Manual (Page 105)

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Security Settings
The AMI BIOS provides a Supervisor and a User password. If you use
both passwords, the Supervisor password must be set first.
Supervisor Password
This item indicates if a Supervisor password has been entered for the
system. "Not Installed" means a Supervisor password has not been
used.
User Password
This item indicates if a user password has been entered for the system.
"Not Installed" means that a user password has not been used.
Change Supervisor Password
Select this item and press <Enter> to access the submenu. Then enter a
new password for the supervisor and press <Enter> to install a new
supervisor password.