Stick the model together as shown. The aircraft is called a delta glider because it is shaped like the Greek letter called delta. Try launching the glider. It is likely that it will be too light at the front. Add a paper clip to the nose of the aircraft, making it easier for the glider to fly through the air.
Delta planes have elevons that serve as both ailerons and elevators.
Make elevons by cutting slits two centimeters long in the positions shown. You should now be able to fold the elevons upwards or downwards along the dotted lines.