How to Hide Basic Landing Pages Wizard Admin Menus

function plt_hide_basic_landing_pages_wizard_menus() {
	//Hide "Landing Pages Wizard".
	remove_menu_page('blpw_wizard');

	//Hide "Basic Landing Pages".
	remove_menu_page('edit.php?post_type=blpw-landing-page');
	//Hide "Basic Landing Pages → Basic Landing Pages".
	remove_submenu_page('edit.php?post_type=blpw-landing-page', 'edit.php?post_type=blpw-landing-page');
	//Hide "Basic Landing Pages → Add New Landing Page".
	remove_submenu_page('edit.php?post_type=blpw-landing-page', 'post-new.php?post_type=blpw-landing-page');
}

add_action('admin_menu', 'plt_hide_basic_landing_pages_wizard_menus', 11);

Where do I put this code?