Phase 1 is now a success. Without USB connection from Creator to KitProg the characters I transmit are received and displayed on Terminal. I have changed the input pin Rx from HZ to Pull Up and it worked on the same pin allocation P12.6 and 12.7. Thanks for the help.
I will separate the KitProg from the target to get in phase 2 of my testing.
I have a question though: after programing the target, is there a verify sequence? To make sure the target was programmed correctly.
I see now that the phase 2 (as I call it) of my tests has no chance to pass because the tracks Rx and Tx from programmer and the target are severed after breaking out the programmer board.
Anyway, I am satisfied that I found the cause of the failure and thank you all for the assistance in debugging.
Thank you both very much for standing by me! That was very kind and made me feel quite happy!