You can adjust your livestream quality by clicking the gear icon in the lower right corner of the stream area while the stream is live. "Auto" analyzes your device an network speed to select the best quality for your configuration.
The livestream should begin automatically. In the event the livestream does not start, refresh your browser window.
Check to make sure your device volume is turned up. Also, some modern browsers do not allow audio to play automatically to prevent websites from playing unwanted ads. If you do not hear any sound coming from the livestream, click within the stream area to unmute the audio.