Well, you can't simply hook it up, you will need a lot of glue logic, because most radio transmitters are analog.
The simplest way is to get a bluetooth module, decode its output with a MCU, and depending on the incoming data, toggle pins, conencted to your robot (motor drivers, leds, etc).
Simplest and most inefficient hack to increase distance is to make a longer antenna. Next, comes hacking the power stage. Oh yeah, this is probably illegal, unless you have some degrees in communication and a license for that frequency.
Try to make more sense in your threads