You must contact the organisation team managing the SSO, because there are big chances you will need to integrate into your application a "client" that will connect to the SSO server. This "client" depends on the technology you use to develop your application. By the way, I assumed you are talking about a Web SSO like OpenID or Google Authentication for instance.
Generally for all SSO, you must have a piece of code to bridge your system with the central authentication.
Active Directory uses Kerberos for instance, so you may want to use Active Directory as a central authentication system, which is not recommended yet.