> I am not sure if i know right how to change a frequency on my nitro
> cars can someone tell me how, what i need and where to get what i need
> from.
Depending on what radio you have it might be either a case of changing the
crystals in the transmitter and receiver, which look something like this:
http://www2.gpmd.com/image/t/tacl4036.jpg
or if your radio is synthesize tuned it can all be done on the radio and
receiver.
Let us know what brand/model of radio you have to simplify things a little.