This chat app itself is useless without a working instance of BlaB! WS or BlaB! WS Pro. Scan the QR code provided by the owner of the site and join the chat.
The app lists phone, microphone, storage and camera. You only need to enable camera when prompted in order to scan the QR code.
The source code is on GitHub: https://github.com/uuencode/BlaB-Q