Reconect the ribbon strips to the LCD pannel conncetors. there is a bit of clear plastci to help you aling the ribbon into the connector, ensure teh black lock is in the up position and it should look like the first image when it's correctly inserted. fold down the black connector to lock in place. Do this for both.

If you have disconnected from the main board reconect to teh board like shown in the first image.

Since the connectors should now be clipped in place. take out of the zip lock bag the 4 silver screws and the bag of the other screws. Placing the 4 screws, one each in the pictured locations to hold the pannel in place. tehre is an alignment pin to help ensure the screw is positioned correctly.