Summarize this article:

Use a clean, damp cloth to wipe away any dirt or debris from the surface of your door frame. Grime can prevent the adhesive strips from sticking to the door frame. Allow the frame to air dry naturally before installing the Magic Mesh screen. Use a measuring tape to measure the height of the door frame. Taking into account the length of the Magic Mesh, calculate whether or not the mesh will drag on the ground. With a pencil, mark the point you need to hang the top of the mesh to prevent it from touching the ground. Use a measuring tape to measure the width of your door frame. Note that measurement, then divide it in half to determine where the middle of the door is. Mark the center point with a pencil. Remove the backings of the adhesive strips that you placed at the halfway point on top of your Magic Mesh. Line up the top of the mesh with the line you marked on top of your door frame. Attach this part of the mesh to the frame. After attaching the top part of your Magic Mesh, continue around the perimeter of the door. Start with the top of the Magic Mesh, moving out towards one side of the door and then the other. Continue down each side of the door frame, making sure that the mesh hangs evenly. For added security, reinforce the Magic Mesh by inserting tacks around the perimeter of the door frame. Put the tacks through the mesh, above or below the adhesive strips. Push the tacks into the wooden frame.   This step is only applicable if you have a wooden door frame. Omit this step if you are installing your Magic Mesh around any other type of door. Test out your Magic Mesh screen by walking through the center of it several times. The magnets should split apart as you walk through them and close back together once you leave the doorway. If the screen does not work as designed, you may need to reinstall it, moving the panels closer or further apart as necessary.

Summary:
Wipe down the door frame and let it air dry. Measure the door's height to determine how high to hang the screen. Measure the door's width and mark the halfway point. Attach the top, middle part of the Magic Mesh first. Continue sticking the rest of the mesh to your door frame. Reinforce the mesh with tacks if you have a wooden door frame. Test the Magic Mesh screen.