1. Try signing in again. (This works a lot of the time)
2. Check your browser's options to make sure that you have cookies enabled.
When you registered you should have received an e-mail from firstname.lastname@example.org. If you didn’t receive that e-mail, add email@example.com to your address book to make sure that the e-mail from that address is delivered to your inbox. You can re-send your confirmation e-mail from your personal control panel.
If you are still having trouble confirming your e-mail address or account, please contact firstname.lastname@example.org. Please be sure to include your e-mail address along with any other information that is relevant to your problem.