How to delete a Facebook app created by yourself
This article will teach you how to delete an app in your Facebook developer account. Be careful because you can’t get it back.
First, go to https://developers.facebook.com/apps/ and select the app you want to remove. Next, select Settings > Advanced from the left-hand pane.
Scroll down to the bottom of the page and click on the red “Delete App” button.
Hit the blue “Delete App” button to continue.
Enter your Facebook password to confirm then click “Submit”.