Forget how to take double pictures.
To take a multiexposure photograph you should first expose the film, and then push the multiexposure button which is on the front of the camera on the top left when you are looking at the front of the camera. After you press this button advance the winding lever to set the shutter, and since the multiexposure button was pressed this shouldn't wind the film to the next frame. Now take your second exposure, and if you want to make another exposure on the same frame repeat the process. Keep in mind that every time you expose a single frame after the initial exposure you will be doubling the exposure on the frame. I usually under expose each exposure by one third on a double exposed frame. If you do more than two exposures I would underexpose each exposure by even more. Multi exposures are fun but tricky, and I would suggest you experiment and have fun with it. I will also say that black and white film is much more controllable and forgiving when it comes to this than color film. I hope this helps!
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