You may choose the server which is indicated on the email you received at the moment of creating the account.
Another way is by choosing the server by reading the first three digits of your account:
|MetaTrader 4 - Instant||
MetaTrader 4 Market
|From 700 to 709||ForexClub-MT4 Real Server||From 720 to 729||ForexClub-MT4 Market Real Server|
|From 710 to 719||ForexClub-MT4 Real 2 Server||From 730 to 739||ForexClub-MT4 Market Real 2 Server|
|From 750 to 769||ForexClub-MT4 Demo Server||From 770 to 779||ForexClub-MT4 Market Demo Server|