Content visible to verified customers only.
Line 1915 of adm-misc.php
The second link should be "adm-misc.php?admact=modfb&remove=$cid", as the coded link doesn't work, meaning that you can't delete feedback.
As a second point, can a user leave feedback for a user on more than one occasion? I ask as I ran a quick test and it seems that if the same user leaves feedback for another user it overwrites the previous feedback record.