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
You can access cPanel in http://<seu dominio>/cpanel
In Cpanel, access SSL / TLS:
After this click in generate, view, or delete SSL certificate signing requests.
You will see this screen, fill the data, and proceed.
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.