NB - If it says "You're already logged in as ... " then you have logged in already. You should be able to click to the Operators only area and see the content there with no problems.
What if the login page says you are not a member ?
1. Either, you are not a member of the Host Group and therefore are not invited. 2. Or, you have not been set up as a member of the site. 3. Or, you are mistyping your email address. 4. Or, other gremlins have intervened.