How to Hide Food Truck Locator Admin Menus

function plt_hide_food_truck_locator_menus() {
	//Hide "Food Truck Locator".
	remove_menu_page('foodtrucklocator-list');
	//Hide "Food Truck Locator → All locations".
	remove_submenu_page('foodtrucklocator-list', 'foodtrucklocator-list');
	//Hide "Food Truck Locator → Add a location".
	remove_submenu_page('foodtrucklocator-list', 'foodtrucklocator-edit');
	//Hide "Food Truck Locator → Settings".
	remove_submenu_page('foodtrucklocator-list', 'foodtrucklocator-settings');
}

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

Where do I put this code?