It’s pretty easy.
First, download the SopCast player here: http://www.sopcast.com/player/
You’ll need Windows Media Player and a Windows-based PC to use it.
Then, check out MyP2P.eu to see what channel each game will be on: http://www.myp2p.eu/competition.php?competitionid=∂=sports&discipline=americanfootball
That’s about it. Enjoy.