Please click the links below for official instructions from each SSL brand.

Geotrust certificate users, please click here for instructions.
RapidSSL certificate users, please click here for instructions.
Comodo certificate users, please click here for instructions.
Symantec certificate users, please click here for instructions.
Thawte certificate users, please click here for instructions.

NOTE: When you generate a CSR, a private key will also be generated at your web server. Please backup the private key or else you will not be able to install the certificate. Since this is a server-side process, we will not have access to the private key so please ensure to backup. If you lose it or if your feel that your private key has been compromised, you can generate a new CSR and request for a reissue of your certificate.