I remember my password, but I forgot the security questions and now I can't log in to my account as it is asking me the security question. It says that the device I'm using is unknown.
The page you see when you log in is related to extra security. You don't need to answer those questions, only to set up some more of those or update the current ones with different answers. This is a security measure implemented by Yahoo to prevent account theft.
Please log in directly to http://edit.yahoo.com to change the security settings.
