Symptom
The Password Hint field is dimmed.
Note: This issue only affects Password Hint field. You may still change your actual password.
Solution
1. Open NetInfo Manager (/Applications/Utilities/).
2. Click the lock icon.
3. Enter your account password.
4. Click "users" in the center column.
5. Click your account name in the right-most column.
6. A list of account properties and values appears in the bottom window. Locate the property named "hint," which should appear fourth in the list. Note that the current password hint text appears to the right of hint. Click the hint text.
7. You may now edit the hint text.
8. When finished, choose Save Changes from the Domain menu.
9. A dialog box appears to confirm the change. Click "Update this copy".
10. Quit NetInfo Manager.