The first step is easy to describe in general but the second step depends on exactly how your SAML implementation works. We provide examples below for the Shibboleth SP but if you run something other than Shibboleth you need to consult your documentation to figure out how the integration works.
...
For Shibboleth this is all handled by providing the single loginInitiatorURL parameter as in the example above.
...
<< Display of SeamlessAccess Login Button | Advanced Integration >>