First, type in the name of your campaign and click "Go!" (if you're just checking things out, put in 'testgame') If the server finds your campaign, you will go to the Main Menu. If the campaign you input does not exist, you will be asked if you want to create a new campaign. The campaign creation feature is not up yet, so if you would like to create a campaign, PM me (tortoise262) on the OotS Forum.
Send questions and comments to me (tortoise262) on the OotS Forum, or on AIM.