Remove an app or game Linked with facebook

To remove an app or game you have linked with your facebook account:
1. First of all Scroll to the bottom of any page and then click Settings & Privacy.
2. After that Click Apps  then proceed to Logged in with Facebook
3. Click the name of any app or game you want to remove from your facebook account and then click Remove App
Once you’ve removed the app or game, it will no longer post to your Timeline. However, its last posts may still appear.you need to remove them manually
Note: The attached app or game may have stored information from when you were using it, but you can contact the facebook developer to ask that they delete any information they may still have.