Story in a User Story Map
What is a Story?
The basic building blocks of a map that describe something you can deliver and evaluate. Stories on the mapping board are treated as a Story issue type in Jira.
Stories are created under swimlane mode either under Release or Sprint.

The picture is shown to create a story under Release Swimlane

Picture showing a story being created under a Sprint swimlane
Created Story “Test Story”

Open the editor dialogue by clicking on the card number i.e., EC-189.