To start with you need to create page, do so by going to WP → Pages → Add New
Name it as you wish ie. Events or Agenda, and instert shortcode [yocalendar/], publish and you can start adding events.
You can input code manually or you can insert it from TinyMCE like so
To add event go to WP → Events → Add New
and fill in the details of the event and publish it.
Note: There are additional setting in WP → yopress → Event Calendar
Social icons visible on the event page are managed from social tab in yopress.