If you're wanting to transfer the Legendary Beasts or Celebi from the 2011 event, you simply need to launch the Relocator from the BW main menu and select DS Download Play on the DS with the Gen 4 game in it. If the Relocator isn't available, you'll need to find a guy in Castelia City who you can tell phrases to and tell him: Everyone Happy and Simple Connection.
If you're trying to transfer anything besides those 4 event Pokémon, then you need to go to the PokéTransfer Lab on Route 15. Like with the Relocator, once you launch the PokéTransfer, you simply select DS Download Play on the DS with the Gen 4 game in it.
Thank you so much I got it figured out! Thanks for answering my stupid questions ^^;