1. Sign in youtube with your existing google account. (same as youtube account).
2. Make sure you’re signed in to the channel you want to delete.
3. Then go to advanced account settings.
4. Click Delete channel
5. You’ll be asked to re-enter your sign-in details to confirm that you want to delete your channel.
Note: You may still see thumbnails of your videos on the site as it takes time to update; they will be removed shortly.