Login to the TR200 (The IP address is found on the back, but is usually 192.168.100.1).
You will see a drop-down list on the left side of the screen. Select Device settings.
In the device settings menu, select Wifi-2.4G settings.
This will pull up the Wi-Fi page. Here, you see SSID and password as options.
If you need to change the Wi-Fi name, delete the text in SSID and replace it with your desired name. After that, click save.
If you need to change the Wi-Fi password, delete the text in Wi-Fi password and replace it with your desired password. After that, click save.