There are only two ways to do it on Mac (as I know).
1) Download TVUPlayer
I tried this and it is quite good. Although there are lots of area need to be improved, it is the only way that I can find for Mac.
Go here to download.
2) Go to http://www.veetle.com/ to watch the P2P TV via the web browser. From my experience, it is now not support the 64bit Safari, you need to use Firefox (I am sure this must work :p) or other browsers .
If you know any other ways, please let me know !