For security purposes, once you are registered to a Race, you will NOT be able to change your Profile information. E.g. Name, Gender, DOB, Email.
If you made a mistake on your registration, you will need to contact the race directly by going to the Race Contact Info section of the race page and filling out the Questions form, or, if you are already registered, you can use the email listed at the bottom of your registration confirmation email.
If you want to change any Race specific details, then please refer to "How do I manage my registration?".