It cannot be done due to simple reason: Samsung BD Player should first support Pal, Secam and NTSC. When it supports only one video encoding standard there will be no use of multy-region capabilities.
Since i am in Canada i can judge only devices sold here. My player cannot play anything but Ntsc encoding. I have a lot of all region DVDs in Pal, none of them work. And the error message is not related to region but to the fact that it is pal.I think you are stuck with some outdated information. SECAM is not a DVD playback format. Although I am not 100% sure of the Samsung BD players, most BD players can read both PAL and NTSC. I am pretty sure that a regionfree NTSC DVD disc will play in the Samsung BD-H5900.