I have registered domain on one server and pointed to justhost server space. I have purchased ssl certificate from thirdparty. Where I have to add the certificate I got , on domain server or justhost server which I have uploaded files?
It's hard to understand your setup but where the certificate lives is ultimately not relevant. What really matters is what is in the Common Name (CN) field of the certificate and/or what is in the Subject Alternative Names (SAN) extension. And the rule is simple: if the user enters https://example.com/this/that/whatever to get to your site then your certificate must contain example.com in the CN component of the subject and/or the SAN extension.