I was playing with few options and accidentally created this meta tag dfgdfgdg, which I shouldn't have. How can I get rid of it? Do I need a moderator to delete it?
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Tags that have no questions are automatically deleted every night at midnight, so you can just remove the tag from your question. The privileges page you linked to is talking about tags that exist on only one question -- if after 6 months the tag is still only on that one question, it's assumed to not be a very good tag and gets removed