To use SSL it is required to obtain SSL
certificate/certificates for your domain.
SSL certificates can be obtained from any SSL authority for varied
price (starting from free for personal certificates at
startssl.com):
http://en.wikipedia.org/wiki/Comparison_of_SSL_certificates_for_web_servers
Some authorities (GoDaddy, for example) can issue a single SSL
certificate for several domains at once.
SSL protocol requires a dedicated IP-address per every certificate.
The advantage of single SSL certificate is that it can be used on a
single IP-address for all domains (and it does not limit the
certificate to single installation, it can be installed several
times on different installations/IP-addresses).
In order to issue certificate SSL authority will request you to
provide a CSR (SSL certificate requests). We can generate CSR (SSL
certificate requests) for you, please contact Support Team with a list of domain
names which needs SSL.
When SSL files for your domains are ready you can simply send it to Support to enable SSL / HTTPS for your domains.