Are you having trouble with your account in which every time you log in, it says password or username is incorrect? You've already reset your password and typed your credentials exactly as is but it still does not let you back in.
If so, the first thing to do is double check your username. Go back to the email received when trying to reset your password to verify your username. In 99% of these cases, the username is not entered correctly (most people accidentally type in their email address instead of their username).
If that still does not work, double check that your credentials are being typed in correctly. Remember, the username and password terminals are case sensitive.