Note: First you have to convert your Instagram Creator/Personal account to Business. Find out how to do that in this guide.
How to connect a Facebook Page to an Instagram Account:
First of all, log into your Facebook page and head to Settings
Once you are in Settings, go ahead and click Linked accounts
Click Instagram and then Connect Account
Confirm one more time.
You will be redirected to Instagram where you have to put in your log in details and click Log in
You will be redirected back to Facebook where you should see the message saying Instagram connected, go ahead and click done.
On some occasions you might have to Review Connection to use all the features, this is essential for Ocoya to work. If you have this error, just click Review Connection
Click Confirm connection.
Once again you will be redirected to Instagram where you have to enter your login details. Once you fill them in go ahead and click Log In
If everything is correct, you should receive a message saying Connection confirmed.