can´t right nero image into dvdr

[Galandriel]

i mate

i´m asking for some help cause i´ve made a nero imageon my pc (4Gb), of a dvd i´ve riped , but i can´t right it into a dvd whith nero.
do someone know how to do that?

And if not, can i convert the image back to vob files? how (please step by step instructions).