you can back into it.
go to your “account” page and enter “quidam” in “view home page, enter name” - click “view”
unfortunately, there are no posts shown for quidam under activity or comments - I think JR clears stuff out every now and again.
click on articles and it will list the threads he\she started. Click on a thread and some error will be returned.
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