Welcome to the forum.
Once registered, you can always use the forum Search to find the answer again
Having said that: I'm guessing you're after a hack to make it region-free?
If so, after a few seconds digging around, I found this:
1) Open the tray.
2) Press STOP
3) Key 7 3 4 4 6 6 0 using the remote.
4) Player should now be region free
I don't own this machine, so can't verify that it works.
EDIT: Haha, olyteddy beat me to the punch!