Yes, you can. The only thing you will have to do is change the Server name in Metatrader settings: just open Menu Tools → Options → Server and enter Server DNS:
- SimpleFX Demo: demo-mt4.simplefx.com
- SimpleFX Live: live-mt4.simplefx.com
If you use your MetaTrader e.g at your job but it can not connect to your server, most likely , your computer is connected to the Internet via firewall or a proxy-server.