gui:config

FIRST - the url to the "first-steps" page that you show on your pop-ups IS NONSELECTABLE - requiring manual typing of the link (if you can remember it from the previous page)
SECOND - once there (quiconfig.freedig.org/guiconfig-first-steps) it produces a 404 error - broken link.
THIRD - there is NO link to ANY instructions on your website!!!!! How the hell do you use this product???!!!!

You can access the addon from the "Tools" menu. The menu item is called "Advanced Settings...". If you are on a Linux machine the menu item is in the "Edit" menu instead.

What popups are you talking about? The only link to the "First Steps" is on addons.mozilla.org and points to http://blog.freedig.org/guiconfig-first-steps which does exist.