Key has been sent!

You're pretty new here, so I'll give you some tips: If the winner is known before the gift/key has been sent, it is possible for people to impersonate them and steal their gift. This is why the winner is not revealed until you have ticked that you have received the game, and for that same reason you should never publicly say thank you or ask about the game until you have received it.

According to the site guidelines and site FAQ, the giveaway creator has a full week to send the gift/key before you should even attempt to make contact. After that, the guidelines and FAQ recommend that you try to contact the creator through Steam (again, using this method is to avoid giving away the winner's identity).