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

You can sign in to Medium using your email address or a third-party social media account.

You need this to get it done:

Email Address
You can sign up to Medium using your email address. The email address you enter will be where you verification email gets sent.
Social Media Account
You can sign up to Medium using a third-party social media account (Google, Facebook or Twitter.) Your username and avatar will be carried over from the account you sign up with. You can also add your Twitter and/or Facebook profile pages to your Medium profile.
If you signed up using an email address, enter a username.
Topics of Interest
Select 3 or more topics you're interested in reading about.
Upload an image to use as your avatar (animated GIFs supported.)
Requirements missing or found errors? Report

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

Medium Help Center - Sign in or sign up to Medium
Official information on how to sign in/sign up to Medium.
Link missing here or found errors? Improve How-Tos