The site doesn't require a confirmed or non-confirmed email address. But we strongly recommend you to have a confirmed one, since it gives the following advantages:

• You can restore your password
• You can change your nickname
• You can unblock your account if it got blocked
• And many more

This private email address is accessible to the administration only and is never shown anywhere on the site. If you want to show your public email – there is a special field for this.
The private email address is set in during registration or in your User’s Profile:

After storing the data an email message with a confirmation code will be sent to the indicated address. You will have to paste the code in a field next to the email address (shown by an arrow):

This code will confirm your address. After saving your email address will be read-only. You can change it only after the confirmation procedure again.