How to use rasa demo

I place rasa-webchat widget in new react app running locally. Then I clone https://github.com/RasaHQ/rasa-demo and train the models etc. Now I want my react app containing webchat widget to communicate with rasa-core in rasa-demo. What I need to change? Please tell me files and code which need’s to be change to work.

there’s instructions here on how to do this under Usage: https://github.com/mrbot-ai/rasa-webchat