Make sure your pi-top [4] is switched off

Find the green Display Cable shown here

You don't need the HDMI or USB-A adapters.

Plug one end of the cable into your pi-top and the other to the back of the screen

Plug in the Power Supply Unit and power up your pi-top [4]

Slide the switch to the left until the green light comes up!

You're all done!

Once your pi-top [4] has powered up, you'll see this screen on your FHD Touch Display