How to Hide the "Custom Cursor Options" Admin Menu

function plt_hide_ultimate_custom_cursor_menus() {
	//Hide the "Settings → Custom Cursor Options" menu.
	remove_submenu_page('options-general.php', 'dl-custom-cursor-options');
}

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

Where do I put this code?