As you will have read in a recent post, the CentOS mirror system is separating from cAos so as to be an independent project in its own right.
There will be more information regarding how to change the mirror setup and where to sync from shortly, however for now we are creating new mailing lists.
If you were subscribed to the caos-mirror mailing list then you will jave been subscribed to this list automatically. (If not - apologies).
The options you subscribed with should be maintained - although your password will have changed.
If you want to know the password that has been set in order to login and change options then you can have it emailled to you here :-
http://lists.centos.org/mailman/options/centos-mirror
Regards Lance