Action Details
Requirements and how-to articles for Medium's action:

You can submit a post (or "story") to be added to a publication (you still retain all rights to the content and can still make changes or withdraw it from the publication altogether.)

You need this to get it done:

A post to submit to a publication.
A publication which you wish to submit your story to. Once you have submitted your post, it will reviewed by the publication editor before being added to the publication.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Medium Help Center - About Medium publications
Official information on publications, including how to submit posts to them.
Link missing here or found errors? Improve How-Tos