There are several types of RSS feeds you may find and subscribe to, on Medium:
User profile
To access a user's feed, add /feed/ before their username: 
medium.com/feed/@Medium
Publications
For a Medium publication's RSS feed, add /feed/ before the publication's name: 
medium.com/feed/the-story
Custom domains
For a  publication on a custom domain, add /feed to the end of the URL: 
https://journal.thriveglobal.com/feed.
Tagged pages in publications
For a feed from a Medium publication's tagged page, add /feed/ before the publication's name: https://medium.com/feed/invironment/tagged/food
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