Thank you for posting. Yes, you can purchase an SSL even if your domain is registered somewhere else. After you request a certificate we need to verify you own the domain by checking publicly available records in the WHOIS database. In some cases, we ask customers to manually verify that they control their domain names. For information on that process, see Verify domain ownership (HTML or DNS).
I'm hosting a web site here but not the domain.
I purchased a SSL certificate and installed in the default domain because it was the only chance in select box. But how can i do to use this certificate with the domain not present at Godaddy?