You can see the correct credentials for logging into your broker trading account, in the email you receiver upon creation of this trading account.
You will find there the account number, the correct broker server and the master password to connect.
Its highly advised to download and install the custom branded MT5 terminal from your broker's website (downloads area) and use it to login into your trading account.

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Very new to MQL and MT5, seeking help
My demo account created with server name "MT5 Demo01" ... but while connecting to account in MT5 it is showing as FxPRO-Demo. Now when I'm running single line limit order code, orders are not getting placed.
I can see on chart but now in "Trade"/"Journal" tab.
Wondering these are different servers or same server ?