SAML SSO operates by passing the identity of the user from one location (the identity provider) to another (the service provider). It is achieved by the exchange of XML documents that are digitally signed.
For step-by-step instructions on SAML / Shibboleth Plugin Configuration, refer YouTube video
For step-by-step instructions on Login with SSOCircle.com, using SAML / Shibboleth Plugin, refer YouTube video