Events ordered by date published

Hi, we are now displaying the events this way:

http://www.elcentrodelaraza.org/events/event/

We are interested in knowing how to order the events by post date, like we can do with the widget. See Events widget here: http://www.elcentrodelaraza.org/

Questions:
– Where is the PHP function I can change?
– If not in the php file, where should I add the code? Currently we just have an Events page with the following code: [eo_events orderby=”date” order=”desc”], but it does not work at all.

Thanks in advance and congratulations for the awesome plugin!

https://wordpress.org/plugins/event-organiser/