To join Live Class, login from your Student / Parent panel then from left sidebar menu click on ZoomLive Classes link. At Live Classes page you will see available Live Classes list here click on Join button. After click on Join button a modal opens with information Host , Date, Duration and Status. If Live Classes is not started then you will see status Waiting.
If live classes is started by teacher then you will see Join Now button in the bottom right corner of the modal. By clicking of Join Now button you will join the Zoom Live classes.