Either your credentials are incorrect or you're connecting to the wrong broker server.
Please ensure your login details are correct, you have the correct Metatrader version and you're connecting to the correct broker server.
To update your MT4/5 password or Account Number go to Configurator > Accounts > Click on the account connection button left of the account settings button > A pop-up of all the account details will appear where you can edit the account details or broker server > Click on update when done.