Sure thing! Thanks for asking, Rebecca!
You can edit the SEO settings of either an unpublished or published story by going to the three dots at the top that lead to a drop-down menu.
This is how it looks in draft view. To get to the SEO settings, you click on More settings.
This is what it looks like on a published story. To set to the SEO settings from here, you click on Story settings.
Hope that was helpful!