From your 'My Hub' page (please see below)
If you hit the 'Menu' icon in the top right...
Then select 'Events' from the options
You can click the 'Create Event' button at the bottom of your screen, from here you will be able to add the name of this event, length and whether it is free or if it will cost your clients to join!
Once your event is created, go to your navigation icon and go to your calendar area. You will be able to click 'Book activity' and add the event to your calendar.
When booking in an event, it will allow you to add the streaming URL (you can use whatever site you wish, such as Zoom!).
Once all information has been added, you can click 'Book Activity' to add to your calendar.