How to stream Webcam and Desktop at the same time?

Hey Guy,

I just got a little Problem with  FMLE... I want to stream live during a Game, but I dont know how to stream Desktop and Webcam at the same time ^^. The streaming Platform i want to use is twitch.tv.. the most common Gamin Platform I think...

I got an IMac i7.

Pls help me   I dont get how all these ProGamer do it -.-

Thanks in advance

Kathi