I agree that is a problem, Ed. There probably should be a Thread Tag field in each initial poster's "Modify" page for any of his subsequent posts in that thread; or an "Add Tag" button in addition to the "Delete" and "Modify" buttons, which would be super handy, at least for the initial poster. Whadaya think, Tim?

Right now, the only other way apparently is to go back to your
original post's "Modify" page, where only the person who began the thread (initial poster) can add tags.
-Joel