Say you have a skin texture that is too dark. Here is an easy way to lighten it up in Poser 5. Just go to the material room, select the body sections you want to lighten, got to the texture map, and reduce the Texture Strength by an amount that gives you the shade you want. A value of 0.7 to 0.5 seems to work well. (Of course you can alway darken the texture by putting a color other than white in the diffuse color box)