What will happen if you make a giveaway then ...

What if you make a giveaway and it the winner does not click "yes i have received the item" ? I am really concerned about this , i just made a giveaway, its my first one!! [url=http://www.steamgifts.com/giveaway/hAynm/men-of-war-condemned-heroes] My first giveaway! / url]