Tableau Server SSO integration

I’m trying to create a Tableau Server SSO Integration with /marketplace/tableau-server-sso.
The instructions are not clear to me.
First of all, what do I need to configure for Audience?
The instructions say: Your Tableau Server audience ({YOUR TABLEAU AUDIENCE}). which is not very helpful.
Then, what (if anything) do I need to configure in Tableau Server for this to work?
The instructions don’t seem to mention anything.