Facebook website authorization

In this case they were using Facebook, and they had to get a form value from the Facebook login page to include on the login request submission. That's not going to be needed for most other sites (there are lots of different ways that websites handle logging in).

Based on your other topic, I don't think you're using Facebook, so let's stick to that other topic and try to work out together what you need to do for your particular site or service.