Attached Link: the truck...version 1.0

Im reposting this again so I can show a pic with it...this isnt to complex is it? Its all relativly low poly count..I just dont get it. Ok this is ticking me off. I made a nice semi and trailer and set it all up with IK..its driving around great. so now I go to texture it. I do a nice base on the truck..cool. So now I want to put a different texture in for the windows. I convert to a layers list (I am following the C bible here) and click on the poly layer...hmmm I cant draw on the cab. Well what about the trailer?...hmm nope..not poly layer, not rectangle, not circle. It adds the layer to my shader tree but it wont let me draw on the model like they do in the book. I accidently erase my model once and then I could edit the shader itself...on this I could draw stuff...why cant I draw on my models??? HELP!!!! heres the url incase it doenst work again ... http://brenthomer.tripod.com/testone.jpg