Before start working:
To be able to tag products, your account must be approved for Instagram purchases.
Make sure you have the latest version of the Instagram application.
To enable product labels:
Open your Instagram business profile
Touch the ellipses (…) or the gear icon in the upper right corner.
In the company settings section, touch Buy.
Select the catalog of products you want to use for Instagram purchases.
Now, from your business profile, you can mark products in posts and stories on Instagram.