Follow the below steps :

To activate the ADM function, press F4 or click the F4
menu option located at the top of the main menu screen.
ADM is an Administrator function that allows the Administrator to configure
and control the overall operation of the Analog KVM Switch.
To activate a submenu option, either move the highlight bar to the desired
option and press ENTER, or double-click the option. On some submenu
screens, an icon to the left of the menu option indicates your selection.