I like to try and take part of the middle part of the Connexta format and use it as the story title.
So from the above example the title of the story would become `set a display name`. In the style of sentence fragments used for other purposes, I don't capitalize it or end with a period.
This is the point at which I often regard the story as ready to discuss. You can get a lot more design and specification into a story, and each team has to set their own thresholds for things.