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

Create a Community playlist post. (If your account has at least 1000 subscribers.)

You need this to get it done:

YouTube Video Playlist
Select a YouTube video playlist to use for your post.
A short description to go alongside the shared video.
Requirements missing or found errors? Report

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

YouTube Help - Engage viewers with Community posts
Information on how to create Community posts.
Link missing here or found errors? Improve How-Tos