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Do you mean how to increase transmitter strength? Doing so may exceed the specs/regulations which apply to the device.
It will help if you are at a high altitude when broadcasting. Also if you are outdoors, away from structures, trees, metal walls, etc.
It may be possible to figure out how to make a better antenna than the walkie-talkie already has.
You can try increasing supply voltage (within limits). However this won't help if there is voltage/current limiting in the output circuitry.
Any other method will involve altering the output circuitry which powers the antenna. Reduce resistances, etc. Of course it is at risk of ruining the unit.
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