The main Events page, accessed from My Freegling, contains a list of the community events that you have submitted to the system. After being approved by a volunteer they will be shown to people who have said they want to hear about events in that location.
You can see and edit your events' details using the relevant links, or use the Remove button if the event is no longer relevant. Events will not be shown to the public after their date has passed, but they will remain in your list so you can edit the dates if the event is repeated later.
If you want to add a new event, use the link at the bottom and submit as much detail as you can. The Add Event page prompts you for all the relevant information (date, time, location etc.). Freegle's emphasis is on community events and those with a general 'green' or 'eco' theme, but other events can also be submitted for volunteer approval.