They haven't given specifics on what you need in order to have them but they have said you can request them. Here's the link for that and make sure you are logged in when you click the request link: https://help.pinterest.com/en/business/article/story-pins
Thanks for jumping in with that link, @heatherfarrisco! @rosekellerandco -- like Heather mentioned, you can request access to Story Pins here. They're still in beta, so not everyone has access to Story Pins quite yet. Let us know if you have any other questions!