Just to confirm, are you trying to change your channel name by following these steps: https://goo.gl/X5S5bX ? Let us know.
Just to confirm, have you tried it on a desktop? Share a screenshot and we'll look into it. Thanks.
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 it on a desktop? Share a screenshot and we'll look into it. Thanks.