The Uniden SPH58E Portable VHF Radio is programmed using a Uniden AMX 500 series P-ROM Writer. The appropriate accessory cable (Which includes some electronic components) is used between the radio's speaker/microphone jack and the AMX 500.
I would suggest you contact your "local" Uniden radio repair shop to see if they still have an AMX 500 on hand
I have the programmer and appropriate interface cable and use them to program my SPH 58E's.