wp-o-matic, Adding line to crontab

Im trying to finish setting up my wp-o-matic plugin from wordpress and Im on the step that says:
“If you want to go automated, and let WP-o-Matic do the nasty job of pulling rss feeds and creating posts, you need to set up a cron job. For performance reasons, it’s highly recommended that you do so, but you can also let WP-o-Matic handle it in browser requests.
Add this line to your crontab, or use your web panel of choice interface. (https://domainname.com/wp-content/pl…p?code=###??###)”

Do I just go to my cpanel> file manager> publi_html> wp_content> plugins> wp-o-matic> cron.php…..than I dont know what to do. How do I add the code to the crontab,what is the process? Thank you