The Broadcast's ability to stream is based on configs (many of which are built into the camera).
Since your streaming bridge could be literally anywhere in the world you need to create the config file for your specific streaming bridge / IP combination. (Using your bridge in different locations may require you to create a new config file).
To do so, you'll need the ATEM desktop software. Open the ATEM Setup application and plug your bridge in using USB. After entering your desired settings you'll save/export the .xml file and place it on an SD card.
On your camera there's a page under Setup where you can 'Import Settings' and then select your new .xml file. This will add your bridge as a destination to the camera.
Source: Pages 129-130 of UBG2 manual (
https://documents.blackmagicdesign.com/ ... 0438010000)