The eagle-eyed among you will notice we've changed these slightly - hopefully making them more easy to use.
The various talk options apart from including/excluding threads from your active conversations list are now together on the customise talk board link. Your list of hidden, or ignored, threads and topics is on the hide & show threads & topics page.
Use that page to hide a particular topic from your active conversations list. If there's a particular thread you'd rather not see in your list, then click the "Hide this thread" link at the top of the thread.
These show/hide links should also work now for people on older Apple Mac computers, for whom the show links were not responding correctly before.
Thanks,
Tech