Create your own network by connecting as many devices as you want (up to seven connections per device). To connect to a certain device tap on it in the device list. If the desired device runs this app as well then the group chat screen will open up.
To send private messages to another user just click on a message from the desired in the group chat user to open up a private chat screen.
Flip through the chat screens (left/right) to pick a certain chat or the list of available devices.
Use the menu to enable this app running in background if you want to allow other users to connect or keep chatting via your device after you closed the app.
A few devices may have trouble to pair properly. To avoid this issue it's recommended to pair those devices before.