To share your screen, navigate to the icon that is shown in the clip below and choose whether do you want to share your tab, window, or the entire screen. You can also share audio from the screenshare if it is from the Chrome Tab or Entire Screen.
Please note that some web browsers do not support audio capture and the table below can help share which browser should have this feature available.
If you are wanting to include background music in your broadcast or bring in audio from something like Discord on your computer, you can do so easily with the screenshare feature as you can also hide the video portion of the screenshare while still allowing the audio to be included in your stream as shared in the clip below!