Once you have ordered your SSL certificate you need to login to your account and navigate to "My Services" where you will see your new certificate. Select "View Details" and you will be presented with a page to setup your certificate. If you select setup your certificate you will need your CSR entered in, you must just select all the lines of your CSR between the -----BEGIN CERTIFICATE REQUEST----- and -----END CERTIFICATE REQUEST----- as these are already filled in for you.
To Generate a CSR using openssl you can use this cmd:
openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key
Please also complete the Registrants details. After you have submitted this your certificate details will be sent off for approval and issued when this process is completed you will be able to download your
certificate from your Services under your account