By going to the question you asked in the Question plugin left side of the dashboard or at the top of the instance in the header, you have the Questions tab. Then, you can choose the question you asked and then you have the options to delete the question in the bottom.
You can use this question as an example. :)
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Hi Atlassian Community! My name is Shana, and I’m on the Jira Software team. One of the many reasons this Community exists is to connect you to others on similar product journeys or with comparabl...
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