Clear the area. Remove any rocks or branches from the area to avoid damage to the lawn edger.
Adjust the depth setting of the lawn edger blade. Set the blade depth to cut 1/2 inch below the concrete. Avoid cutting deeper than 1 inch. A deep cut could be a safety hazard.
Put on safety equipment. Wear safety gloves to prevent blisters. Use safety glasses to protect your eyes from flying debris. Wear socks and proper footwear.
Place the lawn edger in an upright position.
Turn the power on. Position the lawn edger at the corner edge of the lawn, between the grass and concrete. Place the lawn edger's guide wheel against the concrete surface.
Push the lawn edger forward. Apply pressure and push the lawn edger in a straight line, as you walk along the perimeter of the lawn. Keep the lawn edger's wheel guide against the concrete surface, as you walk. Use slow, smooth movements.
Follow the perimeter of the lawn. Stay close to the concrete to create a straight line. Avoid edging too far away from the concrete. This will cause gaps in the lawn.