To replace a window screen, you will need to follow these steps:
Remove the old screen from the window frame. This can typically be done by pressing in on the clips or tabs that hold the screen in place and lifting the screen out of the frame.
Measure the width and height of the window opening to determine the size of the new screen.
Purchase a new screen that fits the dimensions of the window opening. You can find screens at home improvement stores or online.
Lay the new screen on a flat surface and position the frame on top of it.
Staple the screen to the frame using a staple gun. Start at the center of the frame and work your way outward, pulling the screen tight as you go.
Trim any excess screen material from the edges of the frame using a utility knife.
Reinstall the screen in the window frame by pressing the clips or tabs into place.
It’s a good idea to wear protective eyewear and gloves when working with a staple gun, and to be careful when using a utility knife. If you’re not comfortable replacing the screen yourself, you can hire a professional to do it for you.