Please take a look at the example documentation above:
/*
Steps for getting the ESP8266 WebConfig working:
1. Connect to Thinger-Device WiFi with your computer or phone, using "thinger.io" as WiFi password
2. Wait for the configuration window, or navigate to http://192.168.4.1 if it does not appear
3. Configure the wifi where the ESP8266 will be connected, and your thinger.io device credentials
4. Your device should be now connected to the platform.
More details at http://docs.thinger.io/arduino/
*/