Removing dates from posts?

There are 2 ways to remove/hide dates from the posts.
Either using code/plugin OR using CSS
Use plugin WP Date Remover

Refer this link for more detail: https://premium.wpmudev.org/blog/remove-date-from-wordpress-posts/

Where does the style sheet go. Would it go in a child theme. I already tried that and it did not work but my technical skills are very limited so it is most likely me.

Anyway, which file do I edit with this code:

.entry-date {
display: none;
}

Yes, Add that css in child theme style.css and clear the cache.
If it does not work then use plugin WP Date Remover
Let me know if it works

I could not get it to work on my site. Do you have any other ideas I might try. I would like to avoid a plugin if I can.
ragingalcoholic.com