If you have lost your validation email and your account is not validated, you can resend the validation email to yourself by clicking the Lost email to validate account? button on the login panel:
A screen will appear for you to fill in your details and click Resend. You will then be resent a validation email with a link to validate your account.
Note: This email cannot be resent if your account has been validated. You will be notified if this is the case after clicking Resend.