Examples of cron tab commands. These may or may not work, you should contact your host if you aren't sure. Make sure you use the correct path.
Linux
/usr/local/bin/php /home/admin/domains/example.com/public_html/affiliate/control/cron/backup.php
php q /home/admin/domains/example.com/public_html/affiliate/control/cron/backup.php
/usr/local/bin/php q /home/admin/domains/example.com/public_html/affiliate/control/cron/backup.php
Windows
C:\Windows\php\php.exe "C:\server\www\affiliate\control\cron\backup.php"
If you don't understand this, contact your host for assistance. Path is almost always the FULL server path to the cron file.