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Try going to account settings. There is a spot for changing the password there.
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I don't know why it didn't work, however. Also, what "[@Ciaran":](/forums/meta/topics/ask-the-mods-important-questions-v2?post_id=5033063#post_5033063) said, if that fails to go through.
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If you don't remember your current password you may have to request a staff member to look into it.