Once the stream is created click on "Multistream"

Once the stream is created, click + ADD PLATFORM

Copy RTMP URL and Stream Key from instagram

You can enable the source now. If you have selected Push mode then copy RTMP from here and update in your encoder. If it is in Pull mode the stream will be live on the Platform if the source is active

Click on "End Live Video" once the live stream is finished

How to create multistream to Instagram?