can't connect to iCloud with my password

Had a problem yesterday with Key Chain. I lost all my password.

After that I was not able to configure my Mail Icloud account In systme pref. With the Icloud Icon.

It does not accept my password and freeze there.

I remove the the Icloud From application support, now I don't have access to Icloud in the pref. pane Only Mobile Me, But this is out of business.

What Can I do, now.

Thanks

Robert