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.
Hmm, if you have a recovery email or phone number, that might help you regain access: https://goo.gl/7TnbYx . Let us know.
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If it's a legacy channel, you need to link it to a Google Account to access it. Here's how: https://goo.gl/z8YXdy . If you don’t remember your old YouTube password, unfortunately there is no password recovery option for these accounts.
End of conversation
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