Do you mean "reverse the normals?". If you do what form of geo are you creating with the loft - NURBs or Polygons?
For polygons you select "Normals Reverse" from the polygons menu.
For NURBs use "Edit NURBs>Reverse Surface Direction" from the surfaces menu. If the default does not work go to option and try selecting the other options.
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675
Last edited by ctbram; 30-06-2014 at 12:42 AM.