For the schedule section to work you MUST have
installed and
published the
Fabrik schedule system plug-in.
The Fabrik Schedule System Plugin will run on
every front end page load and launches individual crons based on their settings. This is done as one of the very last things that Joomla does, once it has output the page (so you won't notice it when loading a page as a user). It then loads the metadata (settings from #__fabrik_crons) for all your cron plugins, which includes a "last_run", as well as the frequency settings you set for each one. Then it simply runs any which are due (or overdue).