You should first install this application to either Android or iOS device. After installation, read the instructions here to set up the server.
If you have an Android device, you can install apk directly from here.
If you want to run on iOS device, you need to clone this repository and run using flutter:
git clone https://github.com/fb-react-bot/react.bot-frontend.git
cd react.bot-frontend
flutter run
After you set up the server as instructed here, you may need to change ip address and port configuration to which you connect to. Configuration dialog is hidden as below: