http://www.pokemon.com/us/fun-zone/onli ... okemon_fg/
That should be the correct link...
1) Register for the site
2) Play the game (4-5 rounds) (aim for the symbol you want the most)
3) The game will add up the amount of each symbol and reward you with the corresponding Eeveelution
4) OPTIONAL: Decline and try again, only if you don't like what you got.
Eventually the Dream World will work and you will receive the Eeveelution that you won! Note: If they are the same as Japan, they will be male making it impossible to breed, so make sure you get one you like or have friends who don't want theirs. Also, IIRC Japan closed their event before DW opened up, so although we don't have an actual date, ASAP sounds like a good plan.
In case you don't know:
[spoiler5pi]Flareon - Guts
Jolteon - Quick Feet
Vaporeon - Hydration
Espeon - Magic Bounce
Umbreon - Inner Focus
Leafeon - Chlorophyll
Glaceon - Ice Body[/spoiler5pi]
Me? I'm debating between Espeon and Vaporeon... Both sound so good ><