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The domains management allows you to edit the existing domain name for the SharePoint site (which also acts as your front-facing website, too), or add other domains that you have to your Office 365 environment.
The billing and subscription area shows you the subscription you currently have for your organisation, and will give you the option to upgrade if you require more users. For now, during this trial and the Office 365 beta, this will expire in October 2011, in time for general availability.
Three users have been created with full access to Exchange, SharePoint and Lync, therefore three licenses have been used up. Licenses are scalable, so one can add more licenses as and when they are necessary.