Facebook login "given URL not allowed by application configuration'

I've added facebook login to my site. However, when I click the button, I get a red box that says:

Proper way to use "Remember me” functionality in PHP

Short

Working on login system and trying to implement remember me feature.

secure login Android / PHP

I use (sever side) a mysql db with php and (client side) Android. I would like to control data access. How I can make a SECURE login using Android and php?

Android — How to programmatically log into website from a form

The app I am writing involves taking details from the user and using them to access their account on a website. I know how to take details from the user but I don't know how to use those details to log into the website. Does anyone know how I can input these details in the correct boxes? Thanks in advance