Anyone have any idea how to create a __*Group Chatroom*__ in Rocket.Chat? Or is called a _room_ or _channel_?

I Thought it had something to do with the following but I could be wrong: 
<center><p>{"msg": "method","method": "createPrivateGroup","id": "89","params": ["channel-name",["array-of-usernames", "who-are-in-the-channel"]]}</p></center>

<center><p>https://2.bp.blogspot.com/-HUvWO-IlEHA/V5oEDXspOEI/AAAAAAAADaE/zUClX3tWnn01NzuKJErJxMpfGC5124cPACLcB/s1600/chiesechatroom.PNG</p></center>