this is how i subscribe to rss and atom feeds

requirement: device running ios with the shortcuts app

steps

1. create a new shortcut
2. add action "choose from menu"
3. add the titles of the sites you want to follow via "add new item" (mine would just say "godteeth")
4. add action "url" under each item, and add the url of the associated feed you would like to follow
5. add action "end menu" to the bottom of your list
6. add action "get items from rss feed" below that
7. add action "filter articles" below that
8. add action "choose from list" below that
9. add action "open url" below that, and select "menu result" as the url variable (do not select a specific url)

if you do this correctly, you should be able to view your rss feed by simply tapping the shortcut you created initially