FM Transmitter circuit

I wanted to use a 3. 5` jack instead of a microphone, I would need to change something else in the circuit. What would be changed in order to use an audio jack instead of a electret microphone to transmit One like this: taken from an old radio. It has 7 pins, four small knobs on one side, and a bigger one on the other side.

It does not have any model number. One more thing, I hope it doesn`t bother you: Where in the circuit could I add a white LED so I know the battery isn`t dead I think it`s 3V, but maybe it`s more, since it doesn`t look very bright on a cell battery.

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