Bennie,
When a particular radio is not listed on the CHIRP website or in the program, it is not supported (yet). Typically, as I understand it, a radio of the model someone wishes CHIRP to support needs to be supplied, either as a loaner or as a gift, to the developer that is willing to invest the time adding support for the radio to CHIRP.
Your particular radio, the TK-2406, appears to be a fairly unique model, the kenwood programming software, KPG-158, only supports two models (a VHF and a UHF model I suspect).
I think the process to get support for a new radio begins with a 'new model' request, which registered users (free account on chirp website) can enter here:
Be sure and pick 'new model' for the "tracker" field in the top-most field on the web page, and also indicate if you are able to loan your radio to a developer interested in adding support for your radio to CHIRP.
Good luck, happy holidays!
Ken, N2VIP