Hi Marv, unfortunately it's quite difficult to do that - .stl format contains its model data in polygon mesh form, that means the model is made up of a large number of little flat triangle facets.

MoI is not designed to work on that type of polygon mesh data, it works on a very different type of data: NURBS surfaces.

You will probably need to use a polygon mesh editing program to modify that kind of data, not MoI.

There are reverse engineering methods that could be used to construct NURBS surfaces from a dense polygon mesh but they are rather complex and specialized.

See this previous post for some more information:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5149.4

If your nose model has a relatively low number of triangles in it (unlikely), then it could be possible to convert it to .obj format and use Max's ImportObj plugin from here: http://moi.maxsm.net/media/files/ instructions for installing a plug-in are here: http://moi3d.com/wiki/FAQ#Q:_How_do_I_install_a_plug-in_script.3F . But as described in the above link that's not likely to work very well if you have a pretty dense triangle mesh.

- Michael