Add from the Instagram App
Open the Instagram app → Select Edit Profile →Under Business Information, Select Page → Choose a Page from your Pages that you'd like to connect to or select Create a New Facebook Page.
Add from the Facebook site or App
- On the sidebar, under Explore, click Pages.
- Click the name of Facebook Page you want to work with.
- Click Settings.
- Click Instagram.
- Click Log into log in to your Instagram account.
- Enter your user name and password and click Log In.
- Exit the app from the background mode and reopen it again
- Open left menu → Click Profile to make sure that your Instagram account has been added