HOW TO CHANGE TRADING ACCOUNT ON MQL5 VPS SERVER?

I have opened a vps server with metatrader 5. I have done that with a demo account to test and assuming that I could change the account later. I have found that switching to a real account is not easy or cannot be done. I don't know how to contact an mql5 administrator because I can't find any form of contact.

Does anyone know how I can change the demo account to a real account on my vps server?

thanks