How do I write a story here?

There is a button for "ask a question". Where is the button for "write a story?" Maybe I am stupid, but I really don't get it.

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Klesingo · 61-69, F

thanks, but for example when I join "Science & Technology" there are phrases like "I Love Math". is this called a group, or is "Science & Technology" a group? and how can I start an own phrase like "I Love CERN" or something?