Make sure that the texture is a .png file which it should be by default and also make sure you are editing the vehicle's .wtd file and you are selecting the one of the skin slots.
i followed this link http://gtapolicemods.com/showthread....stall-Textures to learn change the skins on vehicles
i follow all steps after i click import text my desk top box pops up and at the bottom is the skin police sign 3 when i click open
annother pop up says police_sign_3png file not found check the file name try again
does anybody know what im doing wrong...