The multiple authors feature allows you to add several contributors to a post. The article will appear on each author’s profile page, just like one of their own posts. The authors you add must be members on the site you’re publishing to. Any author can edit a post they’ve been added to.
To add multiple authors, click your display name in the editor byline area and begin typing an author’s name. To remove an author, hover your cursor over their name and click. The primary author cannot be removed from a post with multiple authors.
Full instruction can be found in the Product team’s Multiple Authors guide.