Your username (not email address) is a unique identifier which allows you to login to your account, utilise our API, assist with identifying yourself in support tickets, and other aspects of our services. You can find your username at the top of your Profile Settings.
It is possible to login to your Viddler account using your email address in place of your username. However, you cannot use your email address in place of your username in all cases. If a service (such as the API or uploading via FTP) isn't working as expected, then please be sure you are entering your username rather than your email address.