because if you don't everyone would be able to do anything and sometimes you need to be banned or congrulated. that's another reason. they need to know who they are talking to
To log on the IEEE website, you have to register and create your own account. Asking a question like this here is effectively the same as asking for a "hack" or someone else's user name and password....
user name and password is very important because both are used for security purpose .if we have important data in our system than any person can have steal data from your system.so in that situation...