Do a View Source on the site's frontpage. You might see some HTML for "application/atom+xml" or "application/rss+xml". The URLs associated with those hrefs will be for the ATOM and RSS feeds.
If you search for one of the following in the HTML source you'll probably run into the feeds:
rss
atom
feed
json
Look for a syndication page on the site. It should have links to the feeds.
You might see the https://commons.wikimedia.org/wiki/File:Generic_Feed-icon.svg or the https://commons.wikimedia.org/wiki/File:Application_atom%2Bxml.svg on the page.
Many CMSes (Wordpress in particular) automatically put them at /feed on the site.