If you log in to Web Config as a sub administrator, you can change the sub administrator's password.
Enter the printer's IP address into a browser to access Web Config.
Enter the printer's IP address from a computer that is connected to the same network as the printer.
You can check the IP address of the printer from the following menu.
Settings > General Settings > Network Settings > (Standard) > Network Status > Wired LAN/Wi-Fi Status
Enter the sub-administrator's user name and password to log in as the administrator.
Select the Product Security tab > User Settings.
Enter your current password in Current password, and then your new password in New Password and Confirm New Password.
Select OK.