Zion Livestreams the 8 AM Sunday service every Sunday. It watch you would just need to go to the livestream page: livestream.com and pick the Discover Tab at the top. Then search for zionbethalto and you will be able to view the event.
If you would like to follow Zion and receive notifications of new events, you would need to create a free live stream account. To create an account the instructions are listed in the link below.
To view the service it is no longer necessary for you to have a livestream account.