How do I add a calendar to my site?

https://www.ads-software.com/extend/plugins/events-calendar/

The ability to add a large public calendar is available by posting a page and adding [events-calendar-large] to the page content to create a stand alone calendar page. Also, when entering an event from the admin section, you can check the box saying “Create Post for Event”, which will cause a post to be created with the event information.

I tried doing this on a new page. It doesn’t work.

any help guys?