You must have a valid email address to be able to complete the online nomination process. You will be asked to supply your email address and a confirmation email containing a 4-digit confirmation code will be sent to that email address. You will need to enter that number to confirm your identity.
In addition, you must have a shooter details record on the SCA Live Scores website database. This will be true if you are a member of SCA or if you have competed in a competition run at an SCA club which uses the SCA live Scores system (not all SCA clubs do yet, unfortunately).