I was able to get to it by clicking someone’s screenname, going to profile page, clicking on “in forum”, copying the URL, substituting quidam for the name, then pasting it into my browser.
Example:
https://freerepublic.com/tag/by:stylin19a/index?tab=comments;brevity=full;options=no-change
https://freerepublic.com/tag/by:quidam/index?tab=comments;brevity=full;options=no-change
clever...