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You can't change it now, once a post is in a community that's where it is. I'd like you to go and read the posting guide I wrote which is pinned to the top of the community feed though, if you do not you're likely to get your next post wrong too. As I say in that posting guide, I am always available to ask questions of, so if you are unsure about what to do/post in my communities you can ask.

Noted, thank you.