To unsubscribe from Live streaming you would go to your Meetings page, and click the "Billing" button:

You will be redirected to My Subscriptions. Click the "Change plan" button near Live streaming:

On the Subscription Purchase page click "Unsubscribe" to cancel the subscription.

To confirm, click "Unsubscribe" in the pop-up window.

You will be redirected to the My Subscriptions, which will contain information about the cancellation of a subscription.

Also, you can keep the subscription by clicking on the button "Keep this subscription".