Spaces are allowed; 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.

Your website. It will be displayed on your profile as well as on the author information box next to all of your articles. If you are posting in different categories, it might be best not to set this here, but to use a link on each article instead.