Prepare the soil by raking gently to remove debris.
Be sure to pick up any stones and kill all weeds in the area.
Spread a thin layer of fresh soil.
Add fertilizer, then mix the fertilizer into the soil by gently raking the area and levelling out the surface.
Immediately sprinkle grass seed using a seed spreader. To ensure the area is evenly covered, sprinkle the seeds over the patch length-wise, then width-wise. Rake the area gently to help the seed into the soil.
Watering the area should take the seed down to the correct depth in the loose soil.
Alternatively, you can use a piece of sod to patch your lawn.