Add a Calendar Event
When logged into website, click on ADD > Event
Fill out the form with your data and press Save or Save & List, at top right of the panel.
Editing A Calendar Event
There are 2 different ways you can edit an event
When logged into website, click on APPS > Calendar
Click on the event in the calendar you want to edit.
Go to the calendar page itself on your website and you will see a pencil icon when you hover over an event. Click that pencil icon to bring up the edit panel for that event.