By following these steps, you can easily create and connect a business account on both Facebook and Instagram
Create an Instagram Business Account
- On Instagram, go to your profile, tap Menu > Settings > Switch to professional account > Switch to business account
Connect Instagram to Facebook Page
- Log into Facebook and switch to the desired Page.
- Click "Settings" > "Linked Accounts" > "Instagram" > "Connect Account" > "Connect"
- From your Facebook Page, you can also click "Manage" and connect your Instagram account from there
References:
Start a business account on Instagram | Meta Business Help Center
How to set up a business account on Instagram
How to Connect or Disconnect an Instagram Account from Your Page | Meta Business Help Center