problems using the reset password function on mac osx server.

Hey ,

Having problems with the reset password functions on the OSX server. When I try to do through the command line it asks for the old password of the user. So how do I fix the problem? Do I have to log in onto the ldap server as the admin and reset from there or is there an easy fix to make the reset password function work. When I try the reset password function the server is not taking the input when I click on change password. So any helpful suggestions are welcome. Verson OSX lion 10.7.5

Thanks in Advance,