This functionality is removed from NLD Go4, its a fully offline app and there were some questions about what else the app was doing with your video feeds
If you want to live stream, I use the Google Play store app "AZ Screen Recorder". The latest version (5.1.1) allows you to capture your Android screen and also stream it live on YouTube or FB.
I can't speak for IOS, but most likely there is an equivalent app on Apple's store.
BTW - This works on both my P4 NLD as well as my M2E. Speaking of the latter, DJI in another of their blunders stripped out many of DJI GO 4 features and require M2E owners to use DJI Pilot. I'll leave that for another thread.