Magazines theme has several custom page templates. To assign a template to page select the template in the Page Attributes box (1).
Create an empty page and select the Contributors template in the Page Attributes box.
On the page of Contributors (you can call the Editorial or something), you will see all site users in roles Author and Contributor. Contributor info will be displayed on the Contributors page if to the availability of filled bio field in the user profile.
To edit information about the author and also to specify him social media links, navigate to Users (Main Admin Menu).