Your site may have a custom banner that includes the site name, or for some reason you don't need the site name in your header. Here's now to remove it.
Alternative menu path: Admin > Appearance > Settings > Bookpoints Customizable
Scroll down to the bottom and you will see a section titled Toggle Display. Open that section and there is a check box next to Site name. If you uncheck that, and click Save Configuration, your site name will not be visible in the heading.