Before you press the shutter button, the counter should be on "S" and should not move when you turn the knob. If it's started moving toward "1", then advance the counter until you're back to "S", load the film and line up the start arrows with the red dot, close the back, push the button, then advance to "1". Also, make sure the multiple exposure button isn't set to "M". The green light should be off when loading the film.

Now you've got me looking at the camera and realizing I left it on after using it last time, and the batteries are dead.