The page Undated Stories is a continuous list with stories that do not have a publication date for at least one platform.
How to enter undated stories:
Option 1: Go to the Undated Stories page and enter a story there. As soon as you save it this story will automatically be listed without a publication date on that page.
Option 2: Open the detailed entry to add a new story. Click on the publication date on the right next to the publication platform. A little window will pop up. Choose "Undated" and save the story. You will find the story on the Undated Stories page.
To move an undated story to your concrete story planning just assign it a publication date (by either choosing the next possible issue or a date).
Please note that you can assign a story to several publication platforms and thus to several publication dates. A story can be in the undated stories list for one platform and also be in the concrete story planning list for another platform with a publication date.