How do I remove this menu bar?

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This might be better directed to the theme developer, as there may be an even easier way of doing this, but there are 3 basic methods to remove a menu:

  1. Unregister the menu

    This might cause issues with the wp_nav_menu() call, but you can use unregister_nav_menu() to remove the menu. You will need to know what it is called.

  2. Remove the call to the menu

    If you open up the header.php file you should see a call to wp_nav_menu() in the <div> with id primary-nav. Remove this and the menu will go away

  3. Remove the menu registration

    This will probably have to be done in tandem with the first if you do decide to do it, you’ll be looking (hopefully in functions.php) for a call to register_nav_menu() or register_nav_menus(), you will need to remove the element that creates the menu.

  4. Hide the menu with CSS

    This is probably the worst option, but it is a viable option. You should set display: none on #primary-nav if you want to use this method. You can either use a plugin to do this or modify style.css directly.

Again, your best option is probably to contact the theme developer for this, but if that’s no use or you just want to learn, these are the ways (in order of best-to-worst practice, IMO) to do it.