The picture shows you the most important tools on the main page:

  1. Clicking the date box gives you a view of the full day, hour by hour to schedule hourly events
  2. Clicking the rounded "+" sign lets you add events on that date.
  3. Clikcing the Event Title let's you see all the details of the event.
Hovering over the event brings up a screen with all the details
The Daily View lets you add events to a particular hour
When you click on the event, the following page shows up, from it you can actually travel to the URL specified in the invitation.