Page 56 of the following refers to entering the Systems Settings. From there, one enters the Security Settings. That is where changes to the password may be performed. My guess is that the default password is admin.
https://business.sharpusa.com/portals/0/downloads/Manuals/MX_3050_3550_4050N_Quick_Start_Guide.pdf
Chances are you must be logged in as administrator, see page 58.
That said, perhaps to following will be of value: When changing the password, be sure to remember the new password.
(It is recommended that you periodically change the administrator password.)
Enter a password consisting of 5 to 32 characters, and tap the [Store] key.
Your setting is made valid only when the machine is turned On again.
• The user-level authentication password is required to add, edit or delete the destination. When you log on, enter
"users" as the user name. Then, enter the user password that you have registered with this option.
The administrator-level authentication password is required to select all settings and the same functions as those
available with the user-level password. When you log on, enter "admin" as the user name. Then, enter the
administrator password that you have registered with this option.
• If you tap the [Store] key without entering a password, the previously set value is assumed. Password protection is
enabled by default
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