SETUP
+10
PREV
NEXT
A screen will appear which will show you that the DVD player is in region 1. Use the left and right arrows to select the region you want to play. When you have selected the region press the SETUP button to exit.
Power off the DVD player, when you power on the DVD player it will select the new region.
Note that you can select region 0 which is a bypass region, which will allow you to play any region, however some of the recent DVD titles being produced with RCE etc will detect that you are on Bypass and will not play.
If you are unsuccesfull with the above code then it may be worth trying one of the resources below.