To connect your Combo account to your Instagram Reels account, head to your Settings > Connections page and click Login with Facebook. You’ll need to make sure your Instagram account is an Instagram Business account. You can read more about that here.
For the best results, make sure your video is anywhere from 5 to 90 seconds long.
To disconnect your account from Combo, head to your settings > Connection page and click the Disconnect button for your connection.
Facebook has made this connection a bit more confusing than it needs to be. Head to the official Facebook website to learn more.