It looks like the answer is in the pictures on the right in the How block near the bottom. You stick a strip called the Optical Data Transfer Surface (ODTS) to

It looks like the answer is in the pictures on the right in the How block near the bottom. You stick a strip called the Optical Data Transfer Surface (ODTS) to the edge of your computer screen. It can somehow read any dataSTICKY that has been stuck to it. Presumably that strip is connected to your computer through a USB cable or Bluetooth. But yeah, it is confusing that the site doesn’t make that clear. They should show how you plug dataSTICKIES in right next to that “not the USB port” image in the Why block.