This is a standard cPanel host with a custom cPanel interface.
Follow the standard cPanel installation as shown in the arpReach online manual.
Cron Task
Use the standard cPanel cron definition:
php-cli /path/to/your/public_html/a/a.php cli/auto
For example:
php-cli /home/mylogin/public_html/a/a.php cli/auto
Mailing Systems
This host does not allow access to an MTA (mail transport agent) such as Sendmail or Exim, so email systems must be set up as local or remote SMTP.