Which country are you located in?

Use this link http://www.emirates.com/english/help/help.aspx
Then scroll down to the place where it says "Find a Local Office". Choose your country and city and it will tell you the name of the local office.

Alternately, you can call the local Skywards call center (Dubai if your country isn't listed).
http://www.skywards.com/Help_servicecentres.aspx

Tell them your problem and they will let you know the appropriate address to send to.