First, modify your Instagram account:

  1. Open your Instagram mobile app and go to your profile
  2. Tap menu icon (☰) in the top right
  3. Click Settings (⚙)
  4. Scroll down and select Switch to Business Profile
  5. Connect your Instagram account with your Facebook page
  6. Select your business category and fill in the profile information

Next, link your Instagram business account from your Facebook business page:

  1. Open your Instagram mobile app and go to your profile
  2. Tap menu icon (☰) in the top right
  3. Click Settings (⚙)
  4. Scroll down and select Linked Accounts, and select Facebook
  5. If you haven't already, enter your Facebook login information
  6. Click Facebook again and choose a page that you manage.