2.- Have to play with Opencaster Panel > Service Account
You will find RTMP Server URL and Stream values.
3.- Open Flash Media Live encoder or another app like wirecast and fill A/V data as you want (bitrate, fps, Size, audio/video format, etc.). Then connect you app to opencaster service:
4.- Connect and start live streaming. Opencaster have one channel per account so just go to http://opencaster.com/wmunguiam