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Or, if you choose not to, you can simply review the results at the end, where it will display the username/login details of the new user, and an automatically generated password for them to use.
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.