Does the motor work at all? If just the mast (the part that moves up and down) is bent, it can be changed very easily. If the mast has broken and pieces remain inside the motor, you'll have to disassemble the motor to fix it.
If the entire motor needs to be changed, you'll need to access the motor behind the fender cover in the engine compartment. According to the manual, you will have to remove the antenna cable from the back of the radio and fish it out as well when the antenna is removed, as it is one integral piece.