This page has links to how to generate CSRs via the RapidSSL Knowledgebase.
For Microsoft IIS 6.0 or 7.0 server, or a Red Hat server, RapidSSL has a new Symantec SSL Assistant to assist in automatically generating a CSR and installing the certificate.
Creating a CSR file is the first step in securing your webserver with SSL.
Certificate Signing Request (CSR) instructions are available for web servers as listed below. Please click on the server to view the instructions.