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.
By chance, did you already try going through these steps to get help signing in: https://goo.gl/v7CdWx ? Let us know if it helps!
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Sorry to hear you're still having trouble. Try this guide and let us know if it helps: https://goo.gl/MZ4Ss3
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