This documentation is not using the current rendering mechanism and will be deleted by December 31st, 2020. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
There is no need for configuration although it is recommended to remove all other SEO related plugins creating metatags in frontend.
However, a few things can still be configured using an extension that overwrites the EXTCONF of yoast_seo or by TypoScript.