The Administrator Interface is simply the tool used to connect to and administer the Server Engine.
To start the Administrator Interface
Click Start > Programs > GlobalSCAPE > CuteFTP Server
The program that runs when you click on the "CuteFTP Server" icon in the start menu is the Administrator Interface.
Once launched, you need to Connect to the Server Engine in order to administer it.
Connecting to the Server Engine
Setting up remote administration