You can make someone co-editor-in-chief after they’ve accepted their invitation and have become part of the editing team. Then, click on their name and add a check mark to make them co-editor-in-chief.
You can also choose to make someone co-editor-in-chief when you send them an invitation to edit the magazine.
A co-editor-in-chief is able to edit all the pages, just like the chief-editor. It is therefore not possible (or needed) to assign pages to a co-editor-in-chief.
Important: Make sure you’re not working on the same page as the co-editor-in-chief!