1.) First, you will need a Facebook Page. If you do not have a Facebook page setup already here is a guide: How to Create a Facebook Business Page
Additional information: Why do I need a Facebook Page?
2.) Next, you will have to switch your Instagram account to an Instagram Business Account: How to Switch to Instagram Business
3.) Connect your Facebook page & Instagram Business Account: How to Connect Facebook Page and Instagram
4.) From your Account Manager page, click "Add Account under Instagram Business Accounts"
5.) Click "Continue with Facebook"
6.) Click "Edit Settings"
7.) Check off your Instagram Business Accounts you wish to connect to Greatly Social, then click "Next"
8.) Check off the pages that are associated with those Instagram Business Accounts, then click "Next"
9.) Click "Done"
10.) Click "OK"
11.) Check off the Instagram accounts you wish to connect, then click "Add Account"