@YouTube why can't I change my profile picture and header on my channel? 
Just to confirm, have you tried changing your channel details by following these steps: https://yt.be/help/VdK5 ? Keep us posted.
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Just to confirm, have you tried changing your channel details by following these steps: https://yt.be/help/VdK5 ? Keep us posted.