newbie111
You'll need to contact your system's administrator/hosting provider to figure out the full path to PHP. Once you have that you will also need the full path to your osTicket files; specifically the api/cron.php
file.
Then in CPanel Cron Job you do Common Settings > every 5 minutes. Then for the Command you do:
/path/to/php /path/to/api/cron.php
If you need further assistance you can contact your system's administrator or hosting provider.
Cheers.