How to sync facebook contacts to my iphone 4s?

I've been told to go to "friends" and than go to "options" and that "sync contacts" should be right there but its not. I did the same thing on my moms iphone 5 and It did not work either.am I missing something.

Log Out of your Facebook than Log Back on On your Phone It Should Ask you if you Want to Sync your Contacts Select The Sync Option And Your Phone Will Sync your Contacts With Facebook

Go to settings and then go to the facebook icon and sign in. Then select Connect to contacts.