The document provides steps to reset a TOTOLINK router's username and password when forgotten. It instructs the user to hold down the reset button for over 10 seconds to restore the router to its factory default settings, wiping all previous configurations. Once reset, the default username and password of "admin/admin" can be used to log back into the router's web interface and configure new credentials. If additional help is needed, the user is advised to contact TOTOLINK customer support.