Enter username and choose an existent channel, or create one just entering a channel name. Channels can be public or private (password protected). If you want to create a private channel just uncheck "Public" and specify a password, then touch the arrow for connecting.
You can write text or dictate it to Google Speech Recognizer.You can also use some keywords, well described inside the app.
To roll dice just write in RPG format, like: 1d4, 1d6, 1d8...You can roll multiple dice writing: 2d4, 4d6, 10d8...By default the app sums dice results, if you want to show separate results just use distinct keyword before the roll.You can roll personalized dice, like d3, d11, d35...