I have a login question linked to rails Facebook.

I'm practicing to log in by linking facebook with rails. Like a hashcode site.

https://launchschool.com/blog/facebook-graph-api-using-omniauth-facebook-and-koala

I'm following the example on the website above.

If you click Login here,

You'll see a screen like this. The client_id = Facebook app's id must appear in the red line to function normally, but it just appears like client_id, so it doesn't work normally.

How do I get the client_id = Facebook app's id normally?I'm curious.