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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.
During the trial, it is not possible to upgrade to a bigger and better subscription. However, once Office 365 reaches general availability, the administrator will be able to purchase more subscriptions as the company grows.