The extension includes a Readme that explains how to install and where to find the SAML settings panel.

This SAML setting panel contains different sections with a bunch of fields. All of them have a short description that explains what value to use on it.

The extension uses the Onelogin php-saml toolkit [1], so take a look at its settings if you have more doubts

[1] https://github.com/onelogin/php-saml#settings