Flip4Mac not working

I wanted to listen to a radio program online, and the website told me i needed to download flip4mac in order to stream from their site. I downloaded it, but it's still saying I need flip4mac when try to listen to the program. Is there something else I need to do besides installing that program in order to stream audio from the web? I'm new to macs, so any help would be greatly appreciated.

Oh the site I'm trying to listen to is knrs.com.

Thanks!!