2) It should take you to this page. Click on to Platform and you will see that the Yes option is checked. Click No. You will be directed back to the Platform so click on it again to check if the option No is checked. If the check remains on the Yes option, check your connection and try again.
I have tried this both on an iOS (iPhone 5) and Android (Samsung) and it works.
I'm still working out where to find it for Desktop users but I believe if you've turned it off from your phone, it would sync with your Facebook profile and should also work when you're using a desktop.