Hello pepito2, Lizzie is correct. If you win a prize in the Reward Store you are contacted via email. If you would like to provide some more details about what you won and when, I would be happy to further research this for you. 

Hi Pepito, welcome to the forums.  Do you mean you won a reward in the Rewards Store?  If so, check your email, especially your spam/junk folder.  You should have gotten an email from "HSN Prize Fulfillment" requesting you to confirm your mailing address.