Your preferred username; punctuation is not allowed except for periods, hyphens, and underscores.

A valid e-mail address. All e-mails from the system will be sent to this address. The e-mail address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by e-mail.

If you want other users to know if your skype is open (and let them comunicate with you), insert here your skype name. For this feature to works you have to enable "show my state on the web" in skype preference pane. The content of this field is kept private and will not be shown publicly.