Open the door to the dryer and remove the screws in the hinge. Lay a towel on top of the dryer. Place the dryer door on the towel with the inside facing up.
Remove the screws from the inside of the dryer door. Disassemble the dryer door carefully, removing the cover on the right side of the innermost section of the door and the shield and hinge from the left side of the innermost section. Reattach the side cover to the left side of the innermost part of the door. Install the new shield to the right side of the door section, with the flat side against the door and the notches facing up (they will face into the dryer). Attach the hinge on the same side as the shield.
Set the top section aside. Rotate the remainder of the door 180 degrees so that the handle is on the left of the upside down door. Check that the latch aligns with the cover before screwing the door back together. Screw the hinge into the corresponding holes on the left side of the dryer door frame. Remove any stickers that might be blocking the holes.
Check the alignment of the door by opening and closing it several times. Loosen the screws on the hinge and nudge the door slightly until the fit is correct. Tighten the screws into place.