How to Connect to Instagram Through Facebook
Using Facebook's Web page user interface
1. On Facebook, navigate to business' Facebook web page.
2. Click Settings.
3. Click Instagram in the sidebar.
4. Click Log in.
5. Enter your Instagram credentials. Click Visit.
Using Facebook's Business Manager
1. On Facebook's Manager, click Organisation Setups.
2. Click Instagram in the sidebar.
3. Click Include.
4. Enter the business' Instagram credentials. Click Next.
Optional: Attach any kind of relevant Advertisement accounts. If you do not want to include one, click Skip.
5. Click Done.