feed url when using page-name permalink

Problem: I want to put the feed url into an rss widget. I used the standard https://www.bluefernpress.com/feed/ with no success. I’m using a static front page and a separate posts page, and I’m using page-name permalinks. I’m happy with how the site looks and how the links look. But the rss feed for individual posts directs to my front page, not the posts page (I have a widget for all 404 not found links to redirect to my front page, because this site replaces another that had different page links).

Me: I don’t understand anything about source code. I’m trying to use menus. I’ve searched the support forum for ideas, but I don’t understand the answers. I’ve tried out all kinds of different feed urls in the widget’s menu. I think I get that the individual posts have their own links created by wordpress. I’ve used the shortlink button to see them. But I can’t change them, like I can change the page permalinks. I like that the list of posts displays on the site with the page-name permalink. But how do I get the rss feed to work? I’d love the ‘for dummies’ version, if possible. Many thanks for any help.