The process to load a uvset is very similar to loading a morph, so i explain it only shortly: In the File-Import menu, you select the entry 'dsf-uvset (.dsf)' and point the file browser to a dsf-file containing a UV-set. UV-sets are somewhere within the data-directory of your DAZStudio installation within a directory named "UV Sets" (illustration top). For example the standard Genesis UVs are in the file

  "data/DAZ 3D/Genesis/Base/UV Sets/DAZ 3D/Base/Genesis.dsf"

After you load it, it will show up in blender under "UV Maps" within the mesh property panel (see illustration, bottom), with a name that was taken from contents of the dsf-file. Blender (like DAZStudio) supports multiple UV maps, so you can load more than one and switch between them.

A final note for these scripts in general and the uv-set import in particular: Because the blender developers are currently working on incorporating the bmesh into blender, the uv-map import currently does not work with any blender newer than 2.62 (it does work with the official 2.62 release). Also, i think there is a high chance, that if you use the bleeding edge version of blender these scripts will just stop working after some blender update. At time of this writing they still work with the svn-version, but from previous experiences i know that this can change any second, you have been warned. Have fun.