You can find(add) new server names in MT4 by below instruction.
1. Go to “File”→“Open an account”→“add new broker like….”
2. Type your broker’s server name, and click “scan”
3. All the relevant server names will appear in the list
*If you cannot login to your account with the login credentials which is given by your broker, you need to contact the support desk.
In case you are still having trouble finding the server name you need to used to login, please contact your broker.