While searching the forums would probably get you good instructions, but if not copy the entire movie as a BD50 to your HDD or if your doing just movie only copy as BD50 select what options you want and start backing up. To do this you make the burner your source and the HDD your target. When your done you will have a BD50 file on your HDD. Now you will select BD25 and make your BD50 folder your source and select a name for your target and press start and you are done. ImgBurn is the preferred burning engine there are plenty of tutorials for setting this up, once it's done burn away!