how can i make my panasonic SL DT 100 dvd player region free ?

first question would be from where to where are you moving , if for
example you move from the US to Europe it would be useless to make
your DVD player region free since there is a difference between the
media (NTSC versus PAL and Secam) and a difference between the power
(110 Volts versus 220/240 volts)

other then that it does not have a code perse it needs a chip update
(either by replacing the chip or by flashing it , there is a site in
russia (of all places) that does it

However with the current prices of dvd players (I've seen them at $40
bucks) I doubt that is worth the trouble