Measure your window opening's width. Next measure a hurricane panel's length. Find the difference between those numbers and divide that number by two. This gives you the amount each side of the panel should overhang the opening by.
Hold the panel at the bottom and center of the opening, with a level check for levelness.
Once the panel is level mark all fastener holes with a pencil. Remove the hurricane panel and use a drill to drill on your pencil marks. Use the correct size drill bit for the fasteners used.
Insert fasteners into holes and secure the hurricane panel to the window opening.
Place the next hurricane panel into place just above the first and repeat the previous steps until the opening is completely covered.