Getting rid of DTPO as my RSS reader

I’ve been using DTPO as my rss reader. For a variety of reasons, I’d now prefer to use NetNewsWire.

The problem is that I can’t turn the DTPO rss reader off. Even when I’m at a site that gives you the option to select the reader you want to use to get its rss feed, no matter what you select it goes to DTPO.

Can someone please tell me a way around this?

see here