To set a static IP address on the CUBE using the techmenu, follow these steps: 

1. Connect a VGA screen to the VGA connection, and attach a USB keyboard to any USB port.
2. Once you have a screen and keyboard attached to the CUBE, power up the CUBE. After the boot up messages show on screen, the screen will go blank. 
   
3. Press "Tab" key, then type "techmenu" (without quotes) then press Enter. You will not see the characters as you type. 
4. This will bring up the Techmenu, which is similar to a bios. Use the arrow and tab keys to move to the correct fields. 
   
5. Be sure to Save Changes with the appropriate key (F5, for example)
   

Here is a link to the detailed Techmenu instructions: http://docs.cubemc.net/InstallGuide/TechMenu.html