mdurrani:
I'm thinking I cant add one, only you can right?
Wrong, you can only use the boards that the Arduino Web Editor currently supports and the ESP8266 is not one of those. You will need to use the standard Arduino IDE, which you can download for free from here:
http://www.arduino.cc/en/Main/Software
You can then follow the standard instructions for adding the ESP8266 core for Arduino to the IDE so you can use your ESP8266.