Do you want to remove a Facebook application? Are you confused becuase the link Application Settings disappeared from the dropdown menu on the top left of the website? Facebook recently changed the items in that menu and unfortunately made it more difficult for users to find which applications they installed and allowed to share their personal data.
Application Settings are now under Privacy Settings. From there you need to go to Applications and Websites and click the link below Edit your settings to continue to Applications, Games and Websites privacy settings. Over there, please note Edit Settings button located on the top right of the site. You can still use one single link to get there: http://www.facebook.com/settings/?tab=applications.
Hope this will help you to get to the settings and change or remove any app you would like to. Let us know if you need more help in comments area.