Here are detailed instructions and requirements for changing your channel art: https://yt.be/help/sg6D . Keep in mind that channel art looks different on desktop, mobile, and TV displays! Let me know if it helps.
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
Here are detailed instructions and requirements for changing your channel art: https://yt.be/help/sg6D . Keep in mind that channel art looks different on desktop, mobile, and TV displays! Let me know if it helps.