You can edit events on any accessible calendar in which you have write or manage permission.
Do one of the following:
Double-click the event that you want to edit. This can be done from any of the calendar views.
Use the drag-and-drop feature if you want to change the date or time of the scheduled event. From any of the calendar views, drag and drop the event from the original date or time to the new date or time. Attendees of the modified events are sent an update that includes the updated event.
Select the event and click the View Event Details link.
The event appears in edit mode in a new tab in the calendar pane. You can modify the attributes based on your requirement. Click Save on the calendar toolbar to save the event.
If the calendar event that you are editing is configured as a recurring event, you are asked to choose whether to edit just a single instance of the event or all the instances in the series.
If the calendar event that you are editing is configured with a web conference, you must provide your web conference credentials, unless you have saved your credentials in Web Conference Options. See Web Conferencing and Setting Web Conference Preferences for more information.