Story Builder automatically assigns a URL slug for each new story based on its title. For example, if you create a story titled "Jetblue will be flying to Europe" its automatic URL slug is /jetblue-will-be-flying-to-europe and its full URL is https://yourdomain.com/jetblue-will-be-flying-to-europe
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To change story slug:

1. Select the story you would like to edit and click on Settings button:

2. Edit the article slug. Make sure you don't leave and spaces.