As of now broadcast supports pages and groups and pages for facebook. If you are facebook group admin or facebook page admin you need to connect facebook.
A)Firstly admin needs to set up Facebook Plugin in backend configuration of facebook
Set "Allow broadcast to Facebook Pages" to yes
Set "Allow broadcast to Facebook Groups" to yes
B)Now From frontend user needs to connect to facebook first. Then select activities to broadcast and save.
Broadcast General Settings
C)Now click on Manage pages and groups and select pages you want and then save settings.
Here List of Pages created by user and joined groups will seen.Now select required and save settings
Broadcast Settings for Pages And Groups:-