The first one will work with every game. The second one will not.
Once you get to the page that lists all the different streaming sites (the second one), then it gets a bit tricky.
Some of the streaming sites are good, some are not good. What you don't wan't is a site that wants to to install or click on things to start the broadcast.
If you do need to use it and I'm around, just post on the game thread. I'll try to get you to a good streaming site.