Edit in JSFiddle

var url = 'https://goinstant.net/joeartsea/test';
goinstant.connect(url, function (err, platformObj, roomObj) {
    if (err) { throw err; }

    var chat = new goinstant.widgets.Chat({
        room: roomObj
    });

    chat.initialize(function (err) {
      if (err) { throw err; }
    });
});

<link rel="stylesheet" href="https://cdn.goinstant.net/widgets/chat/latest/chat.css" />