Hello,
"command line" operates on your server and is accessible if you have SSH connection to your host. You don't need SSH in order to setup Cron task though.
We have no detailed instructions on cron job setup since it differs from host to host depending on Hosting Control Panel software.
Usually, in Hosting CP you should find "Cron Jobs" section, where you'll be able to specify:
1. schedule config (time, days, etc - when sitemap should be regenerated)
2. command to execute - this can be found on "Crawling" tab page of your generator and looks similar to:
/usr/local/bin/php /path/to/generator/runcrawl.hpp