Place the adapter ring on your microscope. The deepest part of the notches face down toward the bottom of the microscope. Secure the ring to the microscope using the 4m x 8m allen head screws and washers supplied. An allen wrench is supplied for this. When the ring is secure, place the stage on top so that the two tabs in the rear of the stage fit into the notches on the adapter ring. Secure the stage onto the ring by tightening the thumbscrew into the notch (which should be lined up with the thumbscrew) on the adapter ring.