1) Go to a Russian proxy like 3.gsr.saariselka.ru
2) Paste the contest link into the blank box of the proxysitehttp://www.stardoll.com/en/contest/view.php?id=3477
and press enter.
3) Log into Stardoll
4) Create a scenery and Save it for the competition
5) Wait till page loads. You should see 'Your contest entry has been submitted' text.
*Also it might take some time for the dress to show up in your suite, This offer ends October 25th.