This application supports guest accounts only and is intended to be used for casual chatting only. There will be official ninchat.com Android client published soonish which will quite likely handle more advanced features too.
You can find full source code by following my home page found here. Also I'm keen to hear some improvement ideas if you find this application usable. You can reach me using my email or on GitHub.
Please do visit http://ninchat.com for fully-featured web based client.