Hi Prashant,
Do you have Admin access to this box? Login as admin then go to System Settings => SAML Single Sign On to enable it. However, you need to satisfy the following conditions:
1, Verify the certificates on the Certificate Management page within Cisco Unified OS Administration to make sure it's valid.
2. At least one user must be associated with full administrative privileges before SAML SSO can be enabled
3. Users must be LDAP synced before SAML SSO can be enabled
HTH.
Regards,
David