Remove the plastic tab holding the glass in place.
Carefully lift the scanner glass panel above the plastic barrier and pull it towards the control panel circuitry. It can take quite a bit of force to get the panel to slide out. If not removed carefully, the scanner glass can shatter
Slide the new panel of glass in to the tabs on the right side of the top panel.
Place your thumb on top of the tab at the top of the panel. grip the outside edge of the panel and roll outward, allowing the scanner glass panel to fall into place.