How do I use the YouTube channel?

The best way is to possess the original channel along with the email id that was used to create it. Make sure you do proper paperwork that establishes you as the new owner of the YouTube channel and gives you all rights over it. You can use an escrow service to secure your payment.
For More Information Please Refer:
https://www.quora.com/Can-I-legally-buy-Youtube-channels
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