To use the shared SSL Certificate, update the hyperlinks that need to be secure to use the base URL of https://secure.hostmonster.com/~yourunixusername.
The yourunixusername is the 8 character username of your Hostmonster account as listed in the cPanel on the left side.

Alternatively, you may use a private SSL Certificate specifically created for your primary domain. For more information about SSL Certificates or purchasing an SSL Certificate and the required Dedicated IP, Click Here.

Note: The shared SSL Certificate can only be used if your account is on a shared IP address.