Well Lithunwrap is a UV mapper, so if you import a model and it says it has no UV data, that's fine - you use Lith to UV map your model and give it that UV info.
Once your have your model loaded into Lith, experiment a bit, select all then play with the UV Mapping commands and see what you can do.
UV mapping is a skill the takes practice, don't expect to learn it straight away but it can be fun once you get past the basics.
There's plenty Lithunwrap tutorials online, be sure to work through some of those to get you on your way.
Van-B

The nature of Monkey was irrepressible!.