Turn the terminal over. There are two levers to push forward and lift up. The case will lift off.
Look for a port labeled, USB HOST. Plug the pin pad cable in there. (Looks like a USB port on a computer)
Where the cords come together and exit into one cable, to the right, pull up on the three soft plastic fillers. If not cut, opening a slot for the exit of the pin pad cable, cut with a scissors or knife. The pin pad cable will then lay nicely into to slot.
Put the case back on the terminal. Plug in cables per prior FAQ. Power up the terminal. The terminal and pin pad will reboot and the pin pad will say welcome after boot up.