To log in to your TOT router, first connect to the network. Open a web browser and enter the default IP address, typically 192.168.1.1, in the address bar. Press Enter, and you'll see the login page. Use the default username 'admin' and password 'admin' to access the settings. Once logged in, it's highly recommended to change the password to enhance security. Navigate to the administration or security section to update your credentials and customize your network settings as needed.