To enable bug tracking, you must have Vault admin privileges and access to the Vault Admin Tool.
Log on to the Vault Admin Tool and go to the Repository Options tab. In the Bug Tracking Integration URL box, type in the URL of your FogBugz site, something like:
http://www.example.com/FogBugz
The integration is automatically enabled when the URL is entered and disabled when it is empty. You do not need to set anything up in FogBugz.