Only to make a few things sure ... I did this wrong myself a few times.
After loading your film It's important to push back the button on the bottom or your film will not wind properly.
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Tab of the film goes into the take-up spool
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Use the dial on the top of the camera to wind film furtheron to the start arrow - if the arrow should be disaligned you probably loose a part of the last frame when the motor drive winds on the rest of the roll to the take-up spool.
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It's also important to keep the film tensioned with your left thumb when you wind the film to the arrow with the top dial.