You can go back and edit the title and chapters in your story at any stage. While you are working in the storymaker template, you will see there are 'edit' buttons displayed:
Below the title and description of your story on the left hand side above the first asset
Next to each chapter title on the right hand side of the screen
Once you have finalised the chapters in your story you can go back and edit the title and description of your story. For example, you may wish to give an overview of the length of the story, the approximate run-time and the intended audience.
You can also edit individual chapters, to refine the title, the text of your story and choose a different asset.
Once you have made any changes, remember to click on save.