I found my posts to see responses.
1. Go to Apple Support Community
https://discussions.apple.com/welcome
2. On the Comments title bar, click the down arrow.
3. Click your name (you should be signed in)
4. Click the Subscription tab
5. Click Filters and select the Discussions (Categories) and Participated (My Content) buttons. (I suppose if you started a thread, it should show up as default "Authored".)
6. Click Apply
A list of your comments should show up with links.
I stumbled on it so there's probably a more elegant solution elsewhere.