Need to delete an application from your facebook profile
Here are few steps which will helps you to remove it easily.
After signing to your facebook account,
Click on Account, which is at the top-right of your screen.
Then click on Application Settings from the list.
Change the Show drop down box to Authorized. This will show all the application you've ever given permission to.
To remove the wishing application just click X button which is far right
Then a pop-up box will appear which asking you that you really wanna remove that application then click on Remove and then Okay.