The WP Event Manager plugin is used for these pages, if the information you are seeking is not in this documentation please check the plugin documentation here https://help.wpdarko.com/en/articles/109610-get-started-with-team-members
From the event manager here an event can by navigating into the event by clickin the title or the pen icon at the end of the row.
The event can then be altered in the same way you created it through the content editor at the top or the Event Data section at the bottom
