My username or password is not accepted

If your username or password is not accepted, there may be several reasons for this:

• Missing registration
  Please make sure that you have already registered. You cannot log in to the system without prior registration.
  

• Incorrect user name
  If you have already registered, you must ensure that you use the email address with which you registered as your username when logging in. And you must use the password you set when you registered as your password.