How to use the Scribunto debug console?

Sorry to ask a question that may be obvious. The Scribunto docs mention a debug console useful for debugging scripts and which handles the output of print statements, but there's no documentation on how to access this console.

When editing a module, scroll to the bottom.

Thanks, hiding in plain sight :-)

BTW it appears that functions you've declared outside of the export can't be called from the debug console, regardless of whether they're declared local? That's too bad.