Remove the movie from its canister and slide the reel onto the feed reel slot, above the lens of the projector. Press the reel toward the projector body until it clicks into a locked position.
Press down the upper loop former lever, usually located above and to the left of the projector lens. Place the leader--the tongue of film that protrudes from the film on the reel--into the threading slot. Slide the leader forward until it touches the initial guide roller.
Put the lamp switch in the "off" position and start the projector motor. The sprockets will begin to turn and pull the end of the film across the lens and through a series of gears until it emerges from an opening below the lens. Keep the motor running until about two feet of 8mm film have run through this opening.
Stop the projector motor and let go of the upper loop former lever.
Pick up the loose end of the film and pull it across the bottoms of the last exposed guide roller sprockets, making sure that the sprockets engage the holes on the film.
Straighten any twists in the film, then take the end of the leader and slip it into the locking slot on the takeup reel. Wind the takeup reel clockwise to tighten it the film. Now you can switch on the lamp, restart the motor and watch the movie.