Go to Yahoo! News to manage your Yahoo! Activity settings.
The yahoo profile Acitivity Sharing page tells me to "Go to Yahoo! News to manage your Yahoo! Activity settings." I can't find a link on the Yahoo News page to manage that setting. My problem is that comments I make on Yahoo News articles appear on my Profile page, but there does not seem to be a way to prevent comments from appearing on my profile page unless I hide the whole page. I'm not going to make my profile visible unless and until my news comments can be made to disappear. (posted 2/14/2013)
You can not update whether Yahoo News comments appear on your profile page from YAHOO activity settings