Extensive information on this is available at http://www.ipserverone.info/control-panel/directadmin/how-to-set-cronjobs-in-DirectAdmin-control-panel/.
This information mentions the path to the PHP parser (/path/to/php/parser). For Versio, this is:
/usr/local/bin/php -q -f
For php 7 domains u will have to use :
/usr/local/php70/bin/php70 - q -f
Your cronjob (the part you enter in the Command field) will look as follows:
/usr/local/bin/php -q -f /home/*your username*/domains/*your domain name*/public_html/cronjob_file >/dev/null 2>&1
We recommend always using the above-mentioned line, instead of the method via wget.