Opt Out Of Free Credit Card Offers

Where I can find a place to "opt-out" of those who offer free credit card?
This www.optoutprescreen.com site will choose not to allow all credit card offers, either for a period of five years or indefinitely. I signed up for this for about Two years I think and I had not. It will take some months to start really working, but it works. If you opt for life then you get a card in the mail you must sign and mail, but definitely worth it!
How to Opt Out of Junk Mail and Catalogs