Unfortunately, this is not possible. When you create an account, it is randomly assigned to a server. However, you can always create a new account and check if it gets assigned to the server of your choice.
Note that the server has no impact on the trading conditions of an account.
Different servers are used by different accounts and services to optimise bandwidth; if there was only one server to service the amount of accounts that exist, it would negatively impact latency for all accounts. As such, spreading the load on servers minimises the impact on your trading experience.
If you have further inquiries, please don't hesitate to contact our Support Team via "Contact Us" function.