Unplug the lamp and make sure the old bulb and lamp are cooled down.
Remove the screws holding the glass protector in place.
Remove the glass protector.
Lift the tubular bulb out of the lamp. It is spring loaded on both sides and should snap out easily.
Remove the new bulb from its packaging, but do not touch the glass. Use gloves or wrap the bulb in cloth or a paper towel.
Snap the new bulb into position.
Replace the protective cover and tighten the screws.