Instead of using this program to change your Kerberos password, you can use Mac OS X's built-in Kerberos client GUI:
- In the Finder, go to /System/Library/CoreServices and double-click on 'Kerberos'.
- Click the 'Tickets' menu
- Click on 'Change Password'
(This assumes your Mac is already configured to use your institution's Kerberos realm.)
Personally, I wouldn't trust my Kerberos password to a third-party program, when the OS already has a built-in program that does the same thing. Plus the Kerberos app has a nicer user interface.