All information about registered athletes can be seen from the “Registrants” tab of a competition.
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While viewing the competition, click the “Registrants” tab under the “Management” subsection. Your various divisions will populate the subsections. From these divisions, you can view registration information about the various athletes, spectators, or volunteers that have registered for your competition.

From this page, you can also edit athlete registration information, including moving them to different divisions. Clicking on "Edit Details" in the right column opens a detailed view, allowing you to further review and edit the details of their registration including any answers they gave to custom field questions (including things such as t-shirt size, pictured below).