Connecting Instagram to Facebook ISSUES?

[Starr Oceana]

I'm having issues connecting Instagram to Facebook on my Iphone. I've gone to help sites. I find NOTHING helpful. I go to SETTINGS > PRIVACY > FACEBOOK where one site told me to go and look for apps asking permissiion to connect. Nothing. Nothing about instagram..

I go to instagram settings to where I can change my sharing settings. I click on Facebook and "Instagram would like to post to your friends on your behalf". I click okay. Then get "Facebook login failed. Make sure you're allowed Instagram to use Facebook is iOS SETTINGS PRIVACY FACEBOOK. I look there, nothing. I look everywhere in settings. Nothing about Instagram at all.

I've installed and reinstalled the app masny times.