Mr Goldstone can't act as an official letter anymore as he is only a private man those days. The only thing he can do is to send a private letter to UN Secretary-General Ban-Ki moon asking to consider his change of heart due to the pressure and dehumiliation he encountered by Israel and the World's Zionists. Knowing that any security council resolution will be vetoed by the US, he might go to the General Assembly, where his report about Gaza will be ready for voting and where it will certainly will pass. From there, without being presented to the UN Security Council, it will pass to the War Criminal Court in Den Haag and will be handled there in the correct manner.
Iraqi police fire tear gas as thousands of protests burst into Green Zone, storm Parliament (AP)
from the article: Israel doesn't believe UN will rescind Goldstone Report