If you manually changed the point from backend Easydiscuss user profile page. the system will not automatically assign the new rank for this user, this user have to perform some action like create new discussion, reply, comment, like and etc, as long as those action can gain the point, the system will re-calculate this user current point and assign to the expected rank for this user.
By the way, I am not really sure how to login on your site in frontend, this is what i always see the screen
http://take.ms/yL34P .