I guess you mean MLCad "use rotation vector values"? Unfortunately there was a bug there, and this feature was disabled starting with version 3.2. You can either enter rotation matrix value (guru friendly method 
or use axis rotation icons in toolbar. Remember that the rotation angle changes according to grid level (coarse/medium/fine) and that you can redefine rotation angle for each grid (settings/general/change/grid)
or use axis rotation icons in toolbar. Remember that the rotation angle changes according to grid level (coarse/medium/fine) and that you can redefine rotation angle for each grid (settings/general/change/grid)