Tightening the hinge on a Dell Latitude Laptop is a relatively simple process. The tools required are a small flat bladed screwdriver (to prize off the bezels) and a small phillips screwdriver (to tighten the hinge).
Firstly, remove the bezel above the keyboard and also the one surrounding the display. There are NO screws holding these in place, so just ease them off with a small flat bladed screwdriver.
Tighten the three screws on the monitor hinges as appropriate.