Task Scheduler script performs system tasks such as: user subscriptions expiration, listings expiration and job/resume alerts mailing.
On the Task Scheduler page of the Admin Panel you can find the detailed instructions to set the Task Scheduler on your server to work the way you need.
To get to this page you need to go to Admin Panel > System Configuration > Task Scheduler.
On the opened page you will see the following instructions:
Also at the bootom of the page you will see the option allowing you to enable pseudo-CRON in a case your hosting does not support cron:
Check the box to enable Pseudo-CRON, enter the desired number of views in the field and press the "Update" button.