You need to download and run the Master Password Utility. Here is the link
Once you have downloaded this application, run it as an administrator and connect your DL2(DataLocker Enterprise) after logging into the device and then enter the current password, then enter the new password and verify the new password.
Please note : This utility must be run on a MS Windows based system. Vista users need to RIGHT CLICK on the program icon and run the utility as an "Administrator"