Discussed already

Learn for 3.x

Fair enough. But, for people new to elgg like me, adding some CSS is faster. For me at least right now. I need to learn how to make a plugin and how to override views one day. I wish there was a tutorial designed for 3 year olds to follow. Then I’d be able to figure it out. 

Well, if you run the cli command once it run once. It doesn't magically start a cron job.

Instead of cPanel using curl/wget to access the URL, setup cPanel to run the cli command:

* * * * * /usr/bin/php /path/to/elgg/vendor/bin/elgg-cli cron -q

Change /usr/bin/php to PHP binary path on your server.

Change /path/to/elgg/vendor/bin/elgg-cli to the elgg-cli binary on your server. If you have installed Elgg with composer it's in /vendor/bin/elgg-cli, if you installed using ZIP or git clone, it's in the root of your Elgg installation.

http://learn.elgg.org/en/3.0/admin/cron.html

Note that you no longer need to setup a gazillion jobs for each period. You only need to setup one cron job that hits the main command every minute. Elgg's cron handler will determine, which cron handlers are due and will run them.

-q flag will supress the output. You can remove it if you want cron logs to be saved on your server (that will flood your server inodes though).

For testing you can use an -i and -f flags. -i for internval name, -f for force run even if job is not due.

Yeah, I realized pretty quickly that the cron won't just magically re-run. LOL! Thank you very much! I got it running.