If you have changed your artist name on Broadjam on the "My Artist Info" page at https://www.broadjam.com/artists/editprofile.php but the change is not applying to your hosted website, please visit the "My Hosting Admin" page at https://www.broadjam.com/artists/hosting.php and click the "Edit" button next to "Site Preferences".
This page contains a "Website Heading Text" textbox. Any text entered into this will override your Broadjam artist name on your hosted website.
You will also notice a "Website Homepage Text" textbox on this page. Text entered here will override the "Artist Description" text entered on your "My Artist Info" page.