well i cant  sign up here... , coz all i can see is federal states of USA that you can register,but  nowhere to be found other ( no USA) countries..??
 
update, i found why i couldnt register,by contacting their live chat

Welcome nikola,Please wait while we get you in contact with one of our representatives... 
  You're now talking to Brian from 'Customer Service' The topic is : registration

Brian> Hello, how may I help you?
Guest> hi,im experiencing problems with registration . i couldnt find my country to register
Brian> What country are you in?
Guest> Im form Serbia,
Guest> thats in europe
Guest> is ti possible for ,me to register?
Guest> if yes , how ?
Brian> Hi Thanks for holding. I checked the list of countries, and you are correct, Serbia is not on the list. Unfortunately, that means we are not able to accept a registration for you.
Guest> thanx anyway
Brian> Yo'
Brian> You're welcome.

at least they had good and quick customer support