How do I add a channel to a channel group?

pubnub.channelGroups.addChannels(
    {
        channels: ['ch1', 'ch2'],
        channelGroup: "myChannelGroup"
    }, 
    function(status) {
        if (status.error) {
            console.log("operation failed w/ status: ", status);
        } else {
            console.log("operation done!")
        }
    }
);

See also:

• how to subscribe to a channel group
• how to remove a channel from a channel group