User Authentication OAuth in Facebook

On my previous tutorial, I’m using the Facebook OAuth button to ask users permission. However, based on Facebook documentation that button combines the login process and authentication in the same time. Therefore the label of the button is “Log In”.

(*grumble: why they don’t create a passing parameter to let us change the button label? )

There is an alternative way to do this. Do it manually!

After a few test by following their documentation, here how do it (click to download).