Hi Tariq and welcome,
For your training purposes you do not need to have a specific story issuetype, story is just a name (although one commonly used) so if you can change it and use whatever you have in your project.
If you still want to add it though (all practice is good practice) first go in to Administration Panel > Issues
That should enable it with your default settings for the project, you can go ahead after that and change the rest of the settings.
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