If your domain name is registered BY PROXY or the WHOIS information is not publicly displayed, you may either send us a screenshot of the control panel for your domain displaying your actual information, or ask your domain registrar for a letter acknowledging your domain ownership.
The fastest option is to temporarily disable the private WHOIS service while an SSL certificate is issued. Once you have the RSA key, you can turn the private WHOIS back on, and then resume with the certificate installation.
The Domain Validated SSL Certificate (Positive SSL) will make your location (i.e. city, state, zip), organization name, and company name available to the public. All other information (e.g. physical address, phone number and email) will remain private.
This is a function of the validation that Comodo performs to prove that your site is secure. While you can enable private WHOIS after the SSL is issued, the information will still be in the certificate. This is typical of most "Company Validated" SSL Certifications on the market.
If you are wanting to keep this information private, it is recommended that you get the Positive SSL instead.