How to Hide the "ACP Settings" Admin Menu

function plt_hide_acclaim_cloud_platform_menus() {
	//Hide the "Settings → ACP Settings" menu.
	remove_submenu_page('options-general.php', 'acp_options');
}

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

Where do I put this code?