Thank you for your inquiry and I’m sorry the Agile development feature is supported in Professional Edition or above. That the document you referring was already out-dated. Once the user stories being put into sprint you can then generate task for it. Details can be found at https://www.youtube.com/watch?v=SqQdE5nYz0U&list=PLLiBQRHikaGZw90fobsxGSLgzY8mei1w0&index=5
And the complete usage of the Agile development features (old name: UeXceler) can be found at https://www.youtube.com/watch?v=vYTHmzcpfT0&list=PLLiBQRHikaGZw90fobsxGSLgzY8mei1w0
If there are any further inquiry, please do not hesitate to contact me.