How can i send a letter to the writers of avatar the last air bender?

I am upset that the production of Avatar the last air bender is canceled. I know they are making a new avatar. Avatar the legend of Korra, but It won't be as good as the original Avatar. That is why I want to send a letter to the writers, and try to influence them to keep the old avatar going. So does anyone know how I can send a letter to them?