You'll need to have at least one of your account related information (i.e email/username). Once you have that here's how you can delete the channel: https://goo.gl/Vz36hX . Hope this helps!
@TeamYouTube How can i take down the channel that my young daughter set up please can you direct message me the information. we cant take it down as we do not know the email or password
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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