If you don’t know How To Share A Facebook Post On Instagram then you can link your Instagram to Facebook and for that you must follow these steps:-
1. Firstly login to your Facebook account and tap on the profile icon in the top left corner.
2. Then go to Settings and Privacy and then tap on Settings.
3. Now choose Accounts Center from the top left menu.
4. Then click on Add accounts and simply login to your Instagram account.

If you don’t know How To Share A Facebook Post On Instagram then you can link your Instagram to Facebook and for that you must follow these steps:-
1. Firstly login to your Facebook account and tap on the profile icon in the top left corner.
2. Then go to Settings and Privacy and then tap on Settings.
3. Now choose Accounts Center from the top left menu.
4. Then click on Add accounts and simply login to your Instagram account.