Need assistance making Ultimate Facebook Plugin work


I'm trying to make this plugin work but for some reason I am not understanding the instructions regarding the creation of the Facebook app.

Is there a video or some further detailed instructions on how to do this?

Basically I'm not getting the options listed. In step 1 it says create an app which sounds stright forward enough but the linnk it redirects me to is full of options.
Step 2 says Look for Site URL - well there a few urls but none ask for site url.

Clearly I'm missing something basic somewhere, any advice or pointing in a general direction of advice would be appreciated.