How to Hide HQ Rental Software Admin Menus

function plt_hide_hq_rental_software_menus() {
	//Hide "HQ Rentals".
	remove_menu_page('hq-wordpress-settings');
	//Hide "HQ Rentals → HQ Rentals".
	remove_submenu_page('hq-wordpress-settings', 'hq-wordpress-settings');
	//Hide "HQ Rentals → Brands".
	remove_submenu_page('hq-wordpress-settings', 'hq-brands');
	//Hide "HQ Rentals → Locations".
	remove_submenu_page('hq-wordpress-settings', 'hq-locations');
	//Hide "HQ Rentals → Vehicle Classes".
	remove_submenu_page('hq-wordpress-settings', 'hq-vehicle-classes');
}

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

Where do I put this code?