According to this tutorial

https://wpdiscuz.com/docs/wpdiscuz-7/plugin-settings/social-login-and-share/facebook-app-configuration/

I need 5o add my own domainname at valid oauth redirect url.

But when i do that, i get a 

Fix the Facebook login error “URL blocked: This redirect failed because the redirect URI is not white-listed in the app's client OAuth...“

Any helpwould be apreciated