According to the Answers FAQ, you need to get 500 karma to close your own questions, and 1000 karma to close someone else's: https://answers.atlassian.com/faq/#karma
However, I see that you have been very active on the site, both asking and answering great questions, so I've just spent a few of my votes to lift your karma upto 501 and now close your own posts :)
All the best,
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