How to block an application in Facebook?

[A]

You can simply remove the app. Just follow these 5 steps:
1) click on the account button (it's on the upper right hand corner)
2) a drop down box unveils. Then click on privacy settings
3) scroll down to where it says apps and websites & click on the edit link
4) click on Edit settings below the headline 'applications you use'
5) then click on your app (in this case, hatari) and click on remove application