You can write in 
English, 
French, 
Portuguese, 
Spanish.
Email :
Contact(@)autistan.org
Messages written with Whatsapp (or Telegram) :
Do not turn on directly.
Address for post office, and for appointments :
Embassy of Autistan
Avenida Nossa Senhora de Copacabana, 542
Copacabana
22020-001 Rio de Janeiro, RJ, Brazil
Never come to the Embassy without an appointment or prior appointment.
Explanation: Here it is close to Autistan, It's hard to put the “Two Worlds” in contact peacefully without some kind of adaptation or preparation.
google.com.br/maps/place/Embassy+of+Autistan+in+Rio
Access from the Metro station “Siqueira Campos” (output “Siqueira Campos”) :
Never come to the Embassy without an appointment or prior appointment.