First, make sure you have patched the game to at least 1.05.
Second, go to the Ironclad Online button in the main menu of the game.
Third, login or create an account if you don't have one.
Fourth, select a player to use or add a player if you don't have one in the list.
You'll be in the looby at that point.
If you're having trouble, read the_Monk's guide located under the green text here. Or update to the 1.1 Beta (1.09) using Impulse from impulsedriven.com.
