Live video helps you share in an authentic way, but sometimes it can be intimidating when you’re on your own. It’s easy to add a guest while you’re broadcasting. Simply tap the new icon on the bottom right and tap “Add” to invite anyone who’s currently watching. Once they join, you’ll see the screen split into two and your friend pop up right below you.
Instagram says you can remove your guest and add another at any time or they can choose to exit on their own. You can share your live video to stories once the broadcast has ended or choose to discard it.
When someone you follow is going live with a friend, you'll see two circles stacked together in the stories bar. Tap on the circles to watch.
Take a look at the video below for more details. You can download Instagram from the App Store for free.