Welcome to the forums and Qlik Sense. Are you using Qlik Sense Desktop, Cloud or Server? I ask because I am not sure what level of access you have to the Data Story telling interface within the app. If you are in Server and using a published app that is available in a stream, you will not be able to create / edit a story if you are not the owner. If you are using Desktop or Cloud and have created an app, visualizations and taken snapshots of your visualizations - you should be able to easily create a story. I'd like to see if this is just a education thing, or if there is an actual product issue with the behavior you are describing. Take a look at these resources also, if you still have an issue, please send us some screen-shots and steps to recreate the issues you are encountering.
Have you seen these videos in our online help - they show exactly how to use this feature.
For your reference there are also other videos in the community here:
Other questions - only applies if you are using Cloud / Enterprise - what browser are you using?
If using Desktop, what operating system are you on?
Please mark the appropriate replies as CORRECT / HELPFUL so our team and other members know that your question(s) has been answered to your satisfaction.