Insert the exposed ends of the joint connectors into the short (vertical) frame and align the four corners so that they meet at perfect right angles
Push 
Push
( fig.2)
5.After making sure that all four corners join at right angles to form a perfect rectangle, fasten the four angles together by using the (x8) joint screws included. (see fig.3)
Screw
4.edge of the screen as seen below. (see fig.4)
( fig.3)
4
