Instagram Live Producer is available to Professional Accounts only and this feature is only available on desktop via Instagram.com. Official help page from Instagram HERE
Instagram isn't an e.commerce platform so your viewers on Instagram won't be able to purchase directly your products.
Select your event then Edit
Select Multistream and activate the Instagram block.
Now create Live video on Instagram
Give a name to your Live event
Select Public or Practice
Retrieve the Stream URL and the Stream key provided by Instagram - NEVER CLOSE THIS WINDOW - You'll need to get back here when going Live.
