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.
Install the extension and set the application context: https://docs.typo3.org/typo3cms/extensions/bsdist/Main/ApplicationContext/Index.html
Restart your webserver server and the ribbon is shown.
You can switch off/on the ribbon in the frontend by adding the static extension template to you main template.
The ribbon is hidden in production context automatically!