Cpanel -> Advanced->Cron Jobs->
As an example for using this feature, we will run a php script (test.php) which sends an e-mail to a predefined e-mail address.
In the command line enter:
/usr/bin/php -q /home/cpanelusername/public_html/test.php
As per the above settings, the command to run the test.php script will be executed every five minutes. Make sure to repalce cpanelusername with your own username.