If the film has already been rewound into the cartridge then you need to use a film leader retriever to fish out the end of it again. You then load the film in the usual way and then in total darkness and without flash, fire the shutter 16 times and wind the film on between each shot. You need to waste an image to preserve those already on the film.
Note that you'll then have to tell the minilab operator what you've done: automatic processing equipment will look at the first few developed negatives to determine the frame spacing. When there's a gap halfway along the frame spacing will likely be out of register with the rest of the film, so you may end up with prints of half on e frame and half another. Also when the machine slices your negs into strips, it may cut halfway through some of the resumed shots. All this attention counts as special processing so may cost more.
But to be honest, the tool and the special processing is going to cost more than just losing the unused shots. Just get what you already have developed and printed and slap a new roll of film in the camera.
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