CATS can automatically post your jobs to Indeed, SimplyHired, Facebook, Twitter, and many other places. To set this up, click on Settings > Administration > Job Posting Services. Most of these sites are free, but some do require you to register and have an account with them to post the jobs.
After you enable the jobs you can click "Configure" to decide if you want every public job you create to auto publish to that service. If you don't select the auto publish box, then you can select where to publish a job after it's created by clicking on the publish button of the job order page.