Creating a Facebook App for "Ultimate Facebook" plugin

Do you have a more updated video about how to create the app we need for this plugin? The video I’m seeing here: https://youtu.be/DmhL2YOhL6g is from 2014 and isn’t working for me. I’m trying to create an app, but it keeps saying my URL needs to match some other URL field that I don’t even see. So I’m stuck on the configuration page for the app inside my website. Thanks! The screenshot attached, is step 2 of the settings; it just hangs here forever. I don’t think it can connect, even though it says it’s connected. I have enabled support access to my website.