In the login-screen you have 'Wachtwoord vergeten?'
You can easily reset your password. Head over to the loginscreen and click on 'Wachtwoord vergeten?'. This wil pop-out a screen to enter your e-mailadress. After that submit the request and you will receive an e-mail with a new password.
The e-mail with your new password can accidentaly end up in your Spam-inbox,
You know your password but you want to change it? Click here.