WordPress Dashboard Problem [closed]

Do you talk about WordPress.com or independent installation of WordPress.org on your server? These are two different things and your question confused because you mentioned that you have your own hosting also. For WordPress.com, contact their support. They should help you with this if you configured your domain there. If you installed WordPress.org independently on your server, I guess you used automatic installation that your hosting may provided. You can try to change the URL through database but best will be to contact your hosting company if you did it like that.