How to save photos from Facebook to my iPhone camera roll?

I'm trying to save a picture from Facebook to my camera roll but it's saying to save this, please allow photo access in your iPhone settings but I'm going through my settings and can't find how to allow it anywhere. What can I do?

Here's how to quickly and easily save photos from Facebook to your iPhone, iPod touch, or iPad camera roll.

Launch the Facebook app.
Go to the picture you would like to have saved to your iPhone.
Press and hold the Home button and then quickly press the Sleep/Wake button. (Yes, you're taking a screenshot!)
Now, go to your Camera Roll and you will find the image that you just saved.

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