If you've used the Mevo app then you'll be very familiar with the destinations page in Multicam. To access the streaming destinations page tap Live.
After selecting the destination (and Profile/Page/Group/Event) tap Start Streaming which will cause the Live button to turn RED indicating that you are actively broadcasting. In addition to the Live button you will also notice the Information Bar has begun showing Stream Duration and Stream Bitrate.
To access the information bar press the arrow next to the Live button.
To STOP your broadcast simply tap the Live button again.