XF 1.5 How to make facebook registration button?

[Stylesfactory]

Hi,
I want to add facebook registration on my forums. Can someone give me a tutorial how to make it?
The most problematic is facebook application.

 

[Paul B]

https://xenforo.com/help/facebook/

Facebook may have changed things since that was written (they have a habit of doing that), but the general principle is the same.