How do I manage created sessions?

Go to 'events' and select the event you want to adjust. Go to the tab 'Sessions'. 
You can manage sessions as long the date of a session is in the future. 
The extra options for sessions, which are in the future, are Edit, Schedule, and Delete the Session. These options will appear when you select the session

The pop-up below will appear when you click on the pencil. Here you can make adjustments and add dates to the session. 

If you want to add a schedule to the session, click on the clock symbol ('Schedule').  Here you can name slots and add start and end time to slots. 

In case of changes, registered participants will be informed of these changes via email.