How to Link Instagram to Facebook Fan Page
Making use of Facebook's Page user interface
1. On Facebook, browse to the business' Facebook page.
2. Click Settings.
3. Click Instagram in the sidebar.
4. Click Visit.
5. Enter your Instagram qualifications. Click Visit.
Using Facebook's Manager
1. On Facebook's Business 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 Ad accounts. If you do not wish to add one, click Avoid.
5. Click Done.