Won a game

There will be a banner underneath the featured giveaway on the home page alerting you that you've won (if I remember correctly). Alternatively, you can click on "Manage" near the top and then "Won".

In b4 jokes about spiders and double posts

Welcome, you'll get a bar like this on every page.

I also recommend reading the FAQ and the search function

I have yet to win anyhting even in a giveaway with 10 people only..

Congratz, I believe it's emailed to you ?

The games you have won: http://www.steamgifts.com/manage/won

When someone have confirmed that they have gotten the gift, it will automatically show up who won the game.

you will see when you will win :D