I release the small black

On the bottom you have the Film rewind button. On the top you have the film rewind knob with crank . Here are the instructions on how to rewind the film. You can tell you have reached the end of the film by the frame counter and the film advance lever. Either the film advance lever will not turn at all or it will not turn all the way. First press in the rewind button, you may immediately let go of it, its on the bottom as shown before. Then turn the rewind crank clock wise until the frame counter, which counts backwards as you rewind, reaches "S" then open the back cover, remove the film, place it back in its canister and have it developed as soon as possible.

On the bottom of the camera, you should find a very small button, with a dot on it. Press this in before you try rewinding. It is the release button.

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