If you are talking about MQL5 VPS, make sure that you are logged into MT5 >> Tools >> Options >> Community with your yashar.seyyedin login and not your email or any other and that your MQL5 account password is no longer than 10 characters.
Problem solved when downloaded the MT5 suggested by MQL5 website.

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Hi everyone. I am trying to start using VPS service but when I try to login it says : "Incorrect login or password".
I am using the exact username and password that I use to login to website. I even tried changing password but still does not work.
what is wrong?
Should I download a different version of MT5?