In order to WP Video Robot Automation tasks to work, you have to use CRON.
Learn how to configure it.
If you have a dedicated server or a VPS, you can set up CRON through SSH. Learn How
If you are on shared hosting, you can set up CRON through cPanel (if it is enabled). Learn How
If you can’t use CRON on your local installation, you can set it up on a Third Party Service such as crondash.com. LearnHow
Note that you can still use built-in WordPress CRON, but WP Video Robot will work only each time someone visits your site, and adding deferred videos will be disabled.