First, make a order of SSL certificate.
After payment access your Client area >> Services, and click in view details of certificate SSL:
In next page, click in View certificate Details
In Cpanel, access SSL / TLS:
On the next page, click Generate, view, upload, or delete SSL certificates.
You will see this screen, fill in this information to continue.
After this your CSR,your CSR will be generated, select and put in the Client Area
After you submit your CSR and data of SSL, you will see this page:
We prefer the first(HTTP based validation), but you can choice others, to receive e-mail.