Are you sure you're using the textures with the right figures? It looks like they are "unimesh" textures. You use them on DAZ's generation 3 figures: M3, David, V3, etc. They won't work on the figures that come with Poser.

You would use Photoshop to layer them over whatever texture you wanted to use as skin, then apply the new texture in the material room.

If you post an image of the results you got, we could probably tell where you went wrong.