You need to take the ship into the vertex room, highlight the model, go into UV editor... what kind of texture do you want to add? If you want a procedural texture, you'll need to use the UV editor, but if you just want to drop a texture to the entire model, or just parts, then you'll go about it a different way. You need to check out the documentation and tutorials, it is too involved to explain. Try it first, then ask questions. Good luck

Never Give Up!