Trouble starting broadcast – Mobcrush: Livestream Games Review

I have downloaded the app and logged into twitch with it. But I have not successfully started a broadcast. I looked at the ‘how to broadcast’ instructions. When I push the screen capture thing, it doesn’t bring me to any menu where I can select mobcrush. It just says that it saved it to my videos (presumably on the iphone itself). I even tried to push and hold the screen capture button. Same result. Please advise...
Review by JFKjew on Mobcrush: Livestream Games.