How do I change My Canon Printer Login Credentials?
To change your Canon printer login credentials, access the printer’s web interface by entering its IP address in a browser. Go to the settings or administration tab, then update the username and password. Save changes and reboot if needed. Always use strong, secure credentials to protect your printer.
https://medium.com/@ljstart-canon/how-do-i-change-my-canon-printer-login-credentials-6797e0ed2ac6