If you have a sidewalk or driveway adjoining your grass, chances are you need an edger to keep the grass from growing onto the paved surface. The reason grass grows over paved surfaces is because over time grass clippings and other debris settle on the edge between the grass and the paved surface. This debris decomposes into a suitable medium into which the grass can root. Gas powered edgers will remove this overgrown material and restore a nicely defined edge between the paved surface and your lawn.
Water the grass to moisten the soil. The edger will have an easier time cutting through moist soil and grass.
Check the oil and gas levels and start the edger. Position the edger where you want to start edging. The guide blade will "ride" along the edge of the paved surface.
Push the edger forward slowly. The rapidly spinning vertical blade will shear off all the grass and debris hanging over the paved surface. Ensure the guide blade follows along the edge of the paved surface to make a straight edge.
Shut down the edger and sweep up all the loosened debris. You should have a clean, straight edge.